Topic: Pronoun (সর্বনাম),

Best Answer Explained in Below-:

The question "What is the objective form of the word 'Who'?" pertains to the grammatical roles that 'who' can play in a sentence. 'Who' is considered the subjective case, used when referring to the subject of a verb—for example, in the sentence "Who is going to the store?" Here, 'who' performs the action of going.

In contrast, the correct answer to the question is 'Whom,' which is the objective form of 'who.' 'Whom' is used when indicating the object of a verb or preposition. For instance, in the sentence "To whom should I address the letter?" 'whom' is receiving the action of addressing.

The choice between 'who' and 'whom' is determined by their grammatical roles: if the noun is doing the action (subject), use 'who'; if it is receiving the action (object), use 'whom.' Other options like 'what' and 'which' do not serve as a form of 'who' and 'whose' indicates possession, which is not relevant. Thus, the objective form of 'who' is correctly identified as 'whom.'