The correct option is D you/his
If the pronoun is receiving the action, it is called a direct object. Object pronouns are always used when the antecedent is a direct object. Here, the third person is ordered to answer the question. The object pronoun for second person singular is "you". The second blank indicates possession in third person singular subjective, that is, the third person's question , hence "his". Hence, Option D is correct. The rest of the options do not adhere to this rule, hence incorrect.