Select the most appropriate option that can substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
The Taj Mahal is one of the much popular seven wonders of the world.

Correct option is D

The correct substitution of the highlighted words is most.
Explanation:
The sentence uses a superlative expression: “one of the ____ seven wonders.” In such expressions, we refer to something that is among the most famous or the best. The correct degree of adjective to be used here is superlative ("most popular") because it fits with “one of the”.
Grammatical rule used:
When using "one of the", the adjective must be in the superlative degree.
Example: He is one of the most intelligent students in the class.
�� Information booster:
Avoid using “much” or “more” with expressions like “one of the.” These are comparative or quantifiers and are incorrect in this grammatical structure.