Topic: Pronoun (সর্বনাম),

Best Answer Explained in Below-:

The sentence "It was __ who came running into the classroom." requires a subject pronoun to complete the thought correctly. Let's analyze the options:

A) "him" is an object pronoun and cannot be used as the subject of a clause. For example, we do not say "Him came running"; it would be grammatically incorrect.

B) "he" is a subject pronoun, which means it can correctly function as the subject of a verb. The structure of the sentence emphasizes the subject by using "It was... who," which anticipates the need for a subject pronoun. Thus, "It was he who came running into the classroom" is grammatically correct because "he" is the one performing the action of coming into the classroom.

C) "her" is also an object pronoun and would not be appropriate in this context, similar to "him."

D) "his" is a possessive pronoun, indicating ownership, and does not make sense in this structure.

Therefore, the only grammatically appropriate choice is B) "he," making it the correct answer.