Select the most appropriate option to fill in the blank.
The man _______ is honest is trusted by everyone.

Correct option is B

The correct option is (b).

The blank requires a relative pronoun to introduce a relative clause describing “the man.” Since “man” refers to a person and is the subject of the clause “___ is honest,” we need a subject relative pronoun. The correct choice is who.

Explanation: “The man who is honest” means the honest man is trusted by everyone. Here, “who” functions as the subject of the verb “is.”

Example: The student who works hard succeeds in exams.

Why other options are incorrect:

• (A) that: Can be used for people or things, but in such clear person-reference, “who” is the most appropriate and standard choice in formal usage.
• (C) he: A personal pronoun cannot introduce a relative clause; it would create an incorrect structure.
• (D) whom: Used as an object relative pronoun (for object position), e.g., “The man whom I met...” not “whom is honest.”