Scientists theorize that a significant increase in atmospheric carbon dioxide levels are contributing to the accelerated melting of polar ice caps, which could have drastic global consequences.

A are

B have been

C is

D were

✓ Correct Answer: Option C

The subject of the verb is 'increase' (a singular noun), not 'levels' (a plural noun). Therefore, the verb must be singular ('is') to agree with 'increase'.

💡 Why is C) the correct answer?

The correct answer to the question "Scientists theorize that a significant increase in atmospheric carbon dioxide levels *are* contributing to the accelerated melting of polar ice caps, which could have drastic global consequences." is Option C: is.

The other options — A) are, B) have been, D) were — are incorrect for this GMAT Exam Prep question. As explained above: The subject of the verb is 'increase' (a singular noun), not 'levels' (a plural noun). Therefore, the verb must be singular ('is') to agree with 'increase'.

📚 About This GMAT Exam Prep Practice Question

This 1-level GMAT Exam Prep question from the Verbal Reasoning topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free GMAT Exam Prep practice test or use flashcards for spaced repetition review.

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Scientists theorize that a significant increase in atmospheric carbon dioxide levels *are* contributing to the accelerated melting of polar ice caps, which could have drastic global consequences.

✓ Correct Answer: Option C

📚 About This GMAT Exam Prep Practice Question

Related GMAT Exam Prep Questions

Scientists theorize that a significant increase in atmospheric carbon dioxide levels are contributing to the accelerated melting of polar ice caps, which could have drastic global consequences.