Real questions from the SAT Climb bank, all at the hard difficulty tier. Pick an answer before you open the explanation. Every question tells you why the answer is right and why each wrong choice is tempting.
Reading & Writing · Standard English Conventions~6 per testHard tier
Subject–verb agreement broken by a long phrase between them.
Pronoun that doesn't match its antecedent.
Dangling or misplaced modifier.
Question 1Hard
Mathematician Emmy Noether, who revolutionized abstract algebra and theoretical physics in the early 20th century despite facing significant gender discrimination in academic institutions, developed ______ groundbreaking theorem connecting symmetries in nature to conservation laws.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is the best answer. The possessive pronoun 'her' agrees with the singular antecedent 'Emmy Noether' and correctly modifies 'groundbreaking theorem.' The long relative clause 'who revolutionized abstract algebra and theoretical physics in the early 20th century despite facing significant gender discrimination in academic institutions' separates the pronoun from its antecedent, but agreement must be maintained.
Why the others are wrong
AThis choice creates a pronoun-antecedent agreement error. The pronoun 'its' is used for non-human entities, not for a person like Emmy Noether.
BThis choice creates a pronoun-antecedent agreement error. The plural possessive 'their' does not agree with the singular antecedent 'Emmy Noether.'
DThis choice creates a pronoun case error. The nominative pronoun 'she' cannot be used as a possessive modifier before 'groundbreaking theorem.'
Question 2Hard
The archaeological team's discovery of a 3,000-year-old settlement in what is now southern Iraq, which includes remnants of pottery, tools, and architectural foundations, ______ new insights into the trade networks of ancient Mesopotamian civilizations.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is the best answer. The singular verb 'provides' agrees with the singular subject 'discovery.' The long interrupting phrase 'of a 3,000-year-old settlement in what is now southern Iraq, which includes remnants of pottery, tools, and architectural foundations' separates the subject from the verb, but the verb must agree with 'discovery,' not with the plural nouns in the interrupting phrase.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'provide' does not agree with the singular subject 'discovery.'
CThis choice creates a tense error. The past tense 'provided' is incorrect because the discovery currently provides insights, not in the past.
DThis choice creates an incomplete sentence. The participle 'providing' cannot serve as the main verb of the sentence without a helping verb.
Question 3Hard
The novelist Toni Morrison, whose work explores the African American experience through lyrical prose and complex narrative structures, often drew upon ______ childhood memories of growing up in Lorain, Ohio, to create richly textured fictional worlds.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why A is right
Choice A is the best answer. The possessive pronoun 'her' agrees with the singular antecedent 'Toni Morrison' and correctly modifies the noun 'childhood memories.' The intervening clause 'whose work explores the African American experience through lyrical prose and complex narrative structures' separates the pronoun from its antecedent, but the pronoun must still agree in number.
Why the others are wrong
BThis choice creates a pronoun-antecedent agreement error. The plural possessive 'their' does not agree with the singular antecedent 'Toni Morrison.'
CThis choice creates a pronoun case error. The nominative pronoun 'she' cannot be used as a possessive modifier before 'childhood memories.'
DThis choice creates a pronoun case error. The independent possessive 'hers' cannot directly modify a noun and requires the noun to be omitted.
Question 4Hard
The ceramic vessels unearthed at the archaeological site in Crete, which researchers believe were used for storing olive oil and wine during religious ceremonies, ______ traces of organic residues that confirm their ceremonial function.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is correct. The plural verb 'contain' agrees with the plural subject 'vessels.' The long relative clause 'which researchers believe were used for storing olive oil and wine during religious ceremonies' separates the subject from the verb, but the verb must still agree with 'vessels,' not with the singular noun 'site' that appears closer to the blank.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The singular verb 'contains' does not agree with the plural subject 'vessels.'
CThis choice creates an incomplete sentence. The participle 'containing' cannot serve as the main verb of the sentence.
DThis choice creates a tense error. The present perfect 'have contained' suggests an action that began in the past and continues to the present, but the context indicates the residues currently exist on the vessels.
Question 5Hard
The Indus Valley Civilization, which flourished in present-day Pakistan and northwestern India from approximately 3300 to 1300 BCE, is renowned for its urban planning and sophisticated drainage systems. Recent archaeological excavations at Mohenjo-daro, one of the civilization's major cities, ______ the discovery of numerous seals bearing undeciphered script, suggesting that the inhabitants possessed a complex writing system whose meaning continues to elude modern scholars.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is correct because the plural verb 'have yielded' agrees with the plural subject 'excavations.' Although the phrase 'at Mohenjo-daro, one of the civilization's major cities' separates the subject from the verb, the verb must still agree with 'excavations,' not with the singular noun 'Mohenjo-daro' that appears closer to the blank.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The singular verb 'has yielded' does not agree with the plural subject 'excavations.'
CThis choice creates a tense error. The present progressive 'are yielding' incorrectly suggests an ongoing action, but the context indicates completed past discoveries ('Recent archaeological excavations').
DThis choice creates a sentence fragment by using the participle 'yielding' without a main verb, and the parallel structure is broken with 'having suggested.'
Question 6Hard
The quantum computing laboratory at MIT, which houses some of the most advanced equipment in the field and attracts researchers from around the world, ______ breakthrough discoveries in error correction that could revolutionize the industry.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is correct. The singular verb 'has announced' agrees with the singular subject 'laboratory.' The long intervening relative clause 'which houses some of the most advanced equipment in the field and attracts researchers from around the world' separates the subject from the verb, but the verb must still agree with 'laboratory,' not the plural nouns in the clause.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'have announced' does not agree with the singular subject 'laboratory.'
CThis choice creates a sentence fragment. The participial phrase 'recently announcing' cannot serve as the main verb of the sentence.
DThis choice creates a tense error. The present tense 'announces' is inconsistent with 'recently,' which signals a completed action requiring present perfect tense.
Question 7Hard
The ancient city of Petra in Jordan, carved into rose-red sandstone cliffs by the Nabataeans more than 2,000 years ago, ______ as both a crucial trade hub on the incense route and an architectural marvel that continues to captivate archaeologists and tourists alike.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The singular verb phrase 'has served' agrees with the singular subject 'city.' The present perfect tense correctly indicates that Petra's dual role as trade hub and architectural marvel began in the past and continues to the present. The long interrupting phrase does not affect subject-verb agreement.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb phrase 'have served' does not agree with the singular subject 'city.'
BThis choice creates an incomplete sentence. The participle 'serving' cannot serve as the main verb without a helping verb.
CThis choice creates a tense error. The past perfect 'had served' incorrectly suggests that Petra's role ended before another past event, but the text indicates its significance continues to the present.
Question 8Hard
Neuroscientist V.S. Ramachandran, whose research on phantom limb syndrome and mirror therapy has revolutionized treatment approaches for amputees experiencing chronic pain, ______ the concept of mirror neurons in 2000, proposing that these specialized brain cells allow humans to understand others' actions by internally simulating them.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why A is right
Choice A is the best answer. The past perfect tense 'had introduced' correctly indicates that Ramachandran introduced the concept before he proposed the explanation, showing the proper sequence of past events. The singular verb agrees with the singular subject 'V.S. Ramachandran.'
Why the others are wrong
BThis choice uses the present tense, which does not correctly express the time relationship between introducing the concept in 2000 and the subsequent proposal. The actions occurred in the past and require past tense.
CThis choice creates a subject-verb agreement error. 'Introduce' is plural, but the subject 'V.S. Ramachandran' is singular and requires a singular verb form.
DThis choice creates an incomplete sentence and an incorrect pronoun case. The object pronoun 'him' cannot serve as a subject, and 'introducing' cannot function as the main verb.
Question 9Hard
The collection of Mayan codices housed in the Dresden library, which survived the Spanish conquest despite systematic destruction of indigenous texts, ______ scholars invaluable insights into pre-Columbian astronomy and calendar systems.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why A is right
Choice A is the best answer. The singular verb 'provides' correctly agrees with the singular subject 'collection.' Although the sentence contains the plural 'codices,' this word is part of a prepositional phrase modifying 'collection,' which remains the grammatical subject requiring singular agreement.
Why the others are wrong
BThis choice incorrectly uses the plural verb 'provide' when the singular subject 'collection' requires singular verb agreement, despite the plural noun 'codices' in the prepositional phrase.
CThis choice uses past tense 'provided' when present tense is needed to indicate that the collection continues to provide insights to scholars today.
DThis choice creates a sentence fragment by replacing the main verb with an object pronoun and participle that cannot function as the sentence's verb.
Question 10Hard
The Archaeological Institute of America, which was founded in 1879 and currently represents over 200,000 members worldwide, ______ excavation projects across six continents, making it one of the oldest and most active organizations dedicated to the study of ancient cultures.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is the best answer. The singular verb 'supports' agrees with the singular subject 'The Archaeological Institute of America.' The long relative clause between the subject and verb might make the plural verb 'support' seem tempting, but the subject remains singular.
Why the others are wrong
AThis choice creates a subject-verb agreement error. 'Support' is plural, but the subject 'The Archaeological Institute of America' is singular and requires the singular verb 'supports.'
CThis choice creates a subject-verb agreement error. 'Have supported' is plural, but the subject is singular. Additionally, the present perfect tense is unnecessary here since the sentence describes ongoing action.
DThis choice creates an incomplete sentence. The participle 'supporting' cannot function as the main verb of the sentence without an auxiliary verb.
Question 11Hard
The series of murals painted by Mexican artist Diego Rivera in the 1930s at the Detroit Institute of Arts, which depict the city's automotive industry and the workers who powered it, ______ been recognized as one of the most significant public art projects of the twentieth century.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is correct. The singular verb 'has' agrees with the singular subject 'series.' Although 'murals' is plural and appears closer to the blank, the subject of the sentence is 'series,' which is singular. The present perfect 'has been' correctly indicates recognition that began in the past and continues.
Why the others are wrong
AThis choice creates an incomplete sentence. The participle 'having' cannot function as the main verb without an auxiliary verb.
BThis choice creates a subject-verb agreement error. The plural verb 'have' does not agree with the singular subject 'series.'
DThis choice creates a subject-verb agreement error and a tense error. The plural verb 'are' does not agree with the singular subject 'series,' and the simple present does not capture the ongoing recognition described.
Question 12Hard
The manuscript, which had been carefully preserved in a monastery library for over eight centuries and only recently made available to scholars through a digitization project, ______ detailed illustrations that shed new light on medieval astronomical knowledge.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is correct. The singular verb 'contains' agrees with the singular subject 'manuscript.' The long relative clause that separates the subject from the verb does not change the need for subject-verb agreement with 'manuscript,' not with 'scholars' or other plural nouns in the intervening phrase.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'contain' does not agree with the singular subject 'manuscript.'
BThis choice creates a tense error. The past perfect 'had contained' would suggest the illustrations existed before another past event, but the context indicates the illustrations currently exist in the manuscript.
DThis choice creates an incomplete sentence. The participle 'containing' cannot function as the main verb without an auxiliary verb.
Question 13Hard
The committee of scientists reviewing the proposal for the new particle accelerator, which included experts from twelve different countries and represented decades of accumulated research experience, ______ unanimous in recommending increased funding for the project.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The singular verb 'was' agrees with the singular collective noun 'committee,' which acts as a single unit. Although the long interrupting phrase contains plural nouns like 'scientists' and 'experts,' the verb must agree with 'committee.' The past tense is correct for describing a completed recommendation.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'were' does not agree with the singular collective noun 'committee.'
BThis choice creates a tense error. The present tense 'are' is incorrect when describing a past recommendation for increased funding.
CThis choice creates an incomplete sentence. The participle 'being' cannot serve as the main verb without a helping verb like 'was' or 'were.'
Question 14Hard
By the time astronomers confirmed the existence of the first exoplanet orbiting a sun-like star in 1995, theoretical physicists ______ for decades about the possibility of planetary systems beyond our own solar system.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The past perfect progressive 'had been speculating' correctly indicates that the speculation began in the past and continued up to the 1995 confirmation. The phrase 'for decades' signals an ongoing action that preceded another past event, requiring the past perfect progressive tense.
Why the others are wrong
AThis choice creates a tense error. The simple past 'speculated' does not capture the ongoing nature of the speculation or its completion before the 1995 confirmation.
BThis choice creates a tense error. The past progressive 'were speculating' does not establish that the speculation occurred before the 1995 confirmation.
CThis choice creates a tense error. The present tense 'speculate' is incorrect when referring to speculation that occurred before 1995.
Question 15Hard
The council of elders in the village, which had governed community affairs for generations and consisted of the most respected members from each of the founding families, ______ to adopt new agricultural practices that would improve crop yields.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The singular verb 'agreed' agrees with the singular collective noun 'council,' which acts as a single unit. The long interrupting relative clause contains plural nouns like 'elders' and 'members,' but the verb must agree with the subject 'council.' The past tense correctly describes the completed action.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'agree' does not agree with the singular collective noun 'council.'
BThis choice creates an incomplete sentence. The participle 'agreeing' cannot serve as the main verb without a helping verb.
CThis choice creates a subject-verb agreement error. The plural verb phrase 'have agreed' does not agree with the singular collective noun 'council.'
Question 16Hard
Marine biologist Sylvia Earle, who has spent over 7,000 hours underwater exploring ocean ecosystems and documenting species previously unknown to science, ______ more than 100 expeditions since beginning her career in the 1950s, earning her the nickname 'Her Deepness' from colleagues.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is the best answer. The present perfect tense 'has led' correctly indicates an action that began in the past ('since beginning her career in the 1950s') and continues to the present. The singular verb also agrees with the singular subject 'Sylvia Earle.'
Why the others are wrong
AThis choice uses the simple present tense, which does not correctly express the time relationship indicated by 'since beginning her career in the 1950s.' The present perfect tense is needed to show action beginning in the past and continuing to the present.
CThis choice creates a subject-verb agreement error. 'Lead' is plural, but the subject 'Sylvia Earle' is singular and requires 'has led.'
DThis choice creates an incomplete sentence. The participle phrase 'having led' cannot function as the main verb without an auxiliary verb like 'has been.'
Question 17Hard
The ornate baroque architecture of the Palace of Versailles, with its gilded halls and intricate ceiling frescoes, ______ visitors from around the world who seek to experience the grandeur of French royal history.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why B is right
Choice B is the best answer. The singular verb 'continues' correctly agrees with the singular subject 'architecture.' The long intervening phrase 'with its gilded halls and intricate ceiling frescoes' separates the subject from the verb, but the verb must still agree with 'architecture,' not the plural nouns in the modifying phrase.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'continue' does not agree with the singular subject 'architecture.'
CThis choice uses past tense incorrectly. The present tense is needed to describe the ongoing attraction of visitors to the palace.
DThis choice creates a sentence fragment. The present participle 'continuing' cannot function as the main verb without a helping verb.
Question 18Hard
The Hubble Space Telescope, which was launched in 1990 and which has captured images of distant galaxies formed billions of years ago, ______ more than 1.5 million observations since astronomers corrected its initial mirror defect in 1993, fundamentally transforming our understanding of cosmic evolution.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The present perfect tense 'has made' correctly indicates an action that began in the past (since 1993) and continues to the present. The singular auxiliary verb 'has' agrees with the singular subject 'The Hubble Space Telescope' despite the intervening relative clauses.
Why the others are wrong
AThis choice creates a subject-verb agreement error. 'Have made' is plural, but 'The Hubble Space Telescope' is singular and requires 'has made.'
BThis choice creates an incomplete sentence. The participle 'making' cannot function as the main verb without an auxiliary verb.
CThis choice uses the simple past tense, which does not correctly express the ongoing nature of the observations indicated by 'since astronomers corrected.' The present perfect 'has made' is needed.
Question 19Hard
In her 1962 book Silent Spring, marine biologist Rachel Carson warned that the widespread use of synthetic pesticides, particularly DDT, would devastate bird populations by causing eggshell thinning. By the early 1970s, studies of bald eagle and peregrine falcon nests ______ the accuracy of Carson's predictions.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why A is right
Choice A is the best answer. The past perfect tense 'had confirmed' correctly indicates that the confirmation by studies occurred before the early 1970s reference point and follows Carson's earlier 1962 prediction. This shows the proper sequence of past events.
Why the others are wrong
BThis choice creates a tense error. The simple past 'confirmed' does not clearly establish that the confirmation occurred after Carson's warning and by a specific past time.
CThis choice creates a tense error. The present tense 'confirms' is incorrect when referring to studies from the early 1970s.
DThis choice creates a subject-verb agreement error. The plural verb phrase 'were confirming' does not agree with the plural subject 'studies,' but the progressive aspect is incorrect for describing completed research findings.
Question 20Hard
The archaeological team, having excavated pottery fragments from multiple layers of sediment at the site in southern Turkey, ______ that the settlement dates back to at least 7000 BCE, making it one of the oldest known agricultural communities in Anatolia.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is the best answer. The singular verb 'concludes' correctly agrees with the collective noun 'team,' which is treated as a single unit. The participial phrase 'having excavated pottery fragments' separates the subject from the verb but does not change the agreement.
Why the others are wrong
AThis choice creates a subject-verb agreement error. The plural verb 'conclude' does not agree with the collective noun 'team,' which takes a singular verb when acting as one unit.
BThis choice creates a tense error. The future tense 'will conclude' is illogical because the archaeological work has already been completed, as indicated by 'having excavated.'
DThis choice creates an incomplete sentence. The participial form 'concluding' cannot serve as the main verb needed to complete the sentence.
Question 21Hard
By the time astronomer Vera Rubin published her findings on galaxy rotation rates in 1980, she ______ decades observing discrepancies between predicted and actual galactic motion, research that would provide crucial evidence for dark matter.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is correct. The past perfect 'had spent' is required to show that the decades of observation occurred before another past event (publishing her findings in 1980). The phrase 'by the time' signals that the past perfect tense is needed to establish the sequence.
Why the others are wrong
AThis choice creates a tense error. The present tense 'spends' is inconsistent with the past time frame established by 'in 1980.'
BThis choice creates a tense error. The past progressive 'was spending' does not correctly establish that the observation period was completed before the 1980 publication.
DThis choice creates both a tense error and a subject-verb agreement error. The present perfect is inappropriate for the past time frame, and 'have spent' does not agree with the singular subject 'she.'
Question 22Hard
Nigerian novelist Chimamanda Ngozi Adichie, whose novel Half of a Yellow Sun won the Orange Prize for Fiction in 2007, ______ TED Talk on the danger of a single story has been viewed over 27 million times and translated into more than 50 languages.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is correct. The singular possessive pronoun 'her' agrees with the singular antecedent 'Chimamanda Ngozi Adichie' and correctly shows possession of the TED Talk. Despite the intervening relative clause, the pronoun must refer back to the subject.
Why the others are wrong
AThis choice creates a pronoun-antecedent agreement error. The plural possessive pronoun 'their' does not agree with the singular antecedent 'Chimamanda Ngozi Adichie.'
BThis choice creates a pronoun-antecedent agreement error. The neuter possessive pronoun 'its' cannot refer to a person.
DThis choice creates a subject-verb agreement error and changes the meaning. The plural verb 'have' does not agree with the singular subject 'Chimamanda Ngozi Adichie,' and it awkwardly adds 'delivered a' when a simple possessive is needed.
Question 23Hard
The archaeological excavations at Çatalhöyük, a Neolithic settlement in modern-day Turkey, have revealed intricate wall paintings and sophisticated urban planning. These findings, which challenge earlier assumptions about prehistoric societies, suggest that the residents of this ancient city, despite lacking written _______ possessed remarkable artistic and organizational capabilities.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why A is right
Choice A is correct. The comma after 'language' properly sets off the participial phrase 'despite lacking written language' as a nonrestrictive modifier, allowing the main clause to continue with the verb 'possessed' that agrees with the plural subject 'residents.'
Why the others are wrong
BThis choice incorrectly omits the comma, creating a run-on structure that fails to properly separate the modifying phrase from the main clause.
CThis choice creates a subject-verb agreement error. The verb 'have' does not agree with the intended structure, and it breaks the logical flow of the sentence.
DThis choice uses the past perfect tense 'had,' which illogically suggests that possessing artistic capabilities occurred before lacking written language, reversing the intended temporal relationship.
Question 24Hard
The geologist examining the core samples from the Arctic ice sheet, which contain trapped air bubbles from over 800,000 years ago, ______ evidence of past climate fluctuations that challenge previous assumptions about glacial cycles.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why D is right
Choice D is the best answer. The present perfect tense 'has discovered' agrees with the singular subject 'geologist' and correctly indicates an action completed in the recent past with present relevance. The long modifying clause about ice sheet samples does not affect subject-verb agreement.
Why the others are wrong
AThis choice incorrectly uses the plural verb 'were' with the singular subject 'geologist,' creating a subject-verb agreement error.
BThis choice uses the simple present tense 'discovers' when the context of examining past evidence requires present perfect to show completed action with current implications.
CThis choice replaces the necessary verb structure with an object pronoun and participle that cannot serve as the main verb of the sentence.
Question 25Hard
Marine biologist Sylvia Earle, whose groundbreaking deep-sea explorations in the 1970s revealed previously unknown ecosystems thriving near hydrothermal vents, ______ over 7,000 hours underwater during her career, setting records that stood for decades.
Which choice completes the text so that it conforms to the conventions of Standard English?
Show the answer and explanation
Why C is right
Choice C is correct. The present perfect 'has spent' indicates an action that began in the past and extends to the present, which aligns with 'during her career.' The singular verb 'has' agrees with the singular subject 'Sylvia Earle,' despite the intervening relative clause.
Why the others are wrong
AThis choice creates a tense error. The past progressive 'was spending' suggests an ongoing action at a specific past moment, but the context requires a tense that connects past actions to the present.
BThis choice creates a tense error. The simple present 'spends' does not capture the completed nature of the career-spanning achievement described.
DThis choice creates a subject-verb agreement error. The plural verb 'have' does not agree with the singular subject 'Sylvia Earle.'
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