Some clauses, called relative pronouns, begin with whom, what, that, or which and serve to modify a noun or pronoun. Hence, option A is correct.
A relative pronoun connects a sentence or phrase to a noun or pronoun. The phrase describes or alters the noun. The most often used relative pronouns are who, whom, whose, which, and that. When and where can also be used as relative pronouns on occasion.
Relative pronouns are used to construct complex statements. Examples of relative pronouns are who, whom, whose, where, when, why, that, and how. Where A location is mentioned. Who identifies a person.
Thus, option A is correct.
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