One of the most significant challenges facing developing countries ___ access to clean water.

A are

B is

C have

D were

✓ Correct Answer: Option B

The subject of the sentence is 'One' (singular), not 'countries' (plural). Therefore, the verb must agree with 'One', making 'is' the correct choice.

💡 Why is B) the correct answer?

The correct answer to the question "One of the most significant challenges facing developing countries ___ access to clean water." is Option B: is.

The other options — A) are, C) have, D) were — are incorrect for this IELTS Exam Prep question. As explained above: The subject of the sentence is 'One' (singular), not 'countries' (plural). Therefore, the verb must agree with 'One', making 'is' the correct choice.

📚 About This IELTS Exam Prep Practice Question

This 2-level IELTS Exam Prep question from the Grammar 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 IELTS Exam Prep practice test or use flashcards for spaced repetition review.

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One of the most significant challenges facing developing countries ___ access to clean water.

✓ Correct Answer: Option B

📚 About This IELTS Exam Prep Practice Question

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