Select the option that will improve the highlighted part of the given sentence. In case no improvement is needed, select 'No improvement required'.
Although the waters may have receded, the aftermath of one of the world's biggest natural disaster had only just begun.

Correct option is A

The correct phrase is "the aftermath of one of the world's biggest natural disasters."
· The noun "disaster" must be in plural form because "one of the" always refers to one among many.
· "World’s" is the correct possessive form, meaning "of the world."
· "Had" in the original sentence is correct as it maintains past perfect tense.
· The incorrect use of "disaster" in singular form makes the original sentence grammatically incorrect.
Grammatical rule used:
· "One of the" + plural noun is the correct structure (e.g., "one of the best movies," "one of the tallest buildings").
Example:
❌ Incorrect: This is one of the best movie I have seen.
✅ Correct: This is one of the best movies I have seen.