A: Could I talk to Prof. Lee? B:（）A.Yes,speaking. B.Oh, it's you C.I am the operator here.

A: Could I talk to Prof. Lee? B:（）A.Yes,speaking. B.Oh, it's you C.I am the operator here.

The correct answer is A. Yes, speaking.

In phone conversations, when someone asks "Could I talk to [Person]?" and you are that person, the standard response is "Yes, speaking." This directly confirms your identity and invites the caller to continue.

Option B ("Oh, it's you") is inappropriate because it assumes prior familiarity with the caller, which isn't indicated in the conversation. Option C ("I am the operator here") would only be relevant if the speaker is a third-party operator, not Prof. Lee themselves.

In phone etiquette, brevity and clarity matter most. "Yes, speaking" efficiently bridges the request and the continuation of the conversation without unnecessary elaboration.