Which of the following pronouns is used to begin a question?

The choice of interrogative pronoun is correct because these pronouns specifically serve the purpose of asking questions. Examples of interrogative pronouns include "who," "whom," "what," "which," and "whose." They help to gather information by initiating inquiries about people, things, or ideas. For instance, in the question "Who is coming to the party?" the interrogative pronoun "who" directly asks for information about a person.

In contrast, reflexive pronouns, such as "myself" or "yourself," are used when the subject and object of the sentence are the same, and they do not initiate questions. Intensive pronouns also refer back to a noun or pronoun to emphasize it, but they serve a different function altogether and do not pose questions either. Possessive pronouns indicate ownership, like "mine," "yours," or "theirs," but they too do not initiate inquiries. Thus, the function of interrogative pronouns makes them the only suitable option for starting a question.