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’.
There are many people in the world who believe that the earth is flat.

Correct option is C

The correct substitution of the highlighted words is (c) No substitution.
Explanation:
· The sentence is in present tense, talking about a general fact/belief held by some people currently.
· “Who believe” is grammatically and contextually correct.
· “That the earth is flat” is the object clause of the verb "believe".
Grammatical Rule Used:
Use simple present to state general truths or ongoing beliefs. The relative pronoun “who” refers to “people”, and “believe” matches subject-verb agreement.
Example:
· There are scientists who claim that aliens exist.
�� Information Booster: Use "believe" (verb) not "belief" (noun) after "who" because we need an action here, not an object.