12. Susan: Excuse me, may I exchange this shirt? Clerk: What’s the problem, ma’am?________ Susan: No, the size is OK. But there’s a stain on its back. Clerk: Oh, sorry about that. Let me get you a new one. (A) Is it too big for you? (B) Do you have it in red? (C) Is this your final price? (D) Do you have the receipt?