Improve the highlighted part of the sentence. Choose ‘No improvement’ as an answer if the sentence is grammatically correct.
It is the most effective means of mass communication.

Correct option is B

The correct answer is (b) No improvement.
Explanation:
The sentence is grammatically correct. "Means" is a singular noun when referring to a method, and it is rightly qualified by “the most effective”. The article “the” is correct before a superlative.
Grammatical rule used:
Superlative degree adjectives (e.g., most effective) are preceded by "the" when specifying one among many.
Example: This is the most interesting book I have read.
Information Booster:
“Means” can be singular or plural depending on the context. In this case, it refers to a single method of communication.