W: Good morning, sir. Can I help you? M: I'd like to buy a blue jacket. Do you have any blue jackets? W: Yes. What size do you wear? M: I want Size M. W: Here you are. Try it on and see whether it is all right for you. M: It's all right. I like it very much. How much is it? W: 360 Yuan. M: Oh. That's a bit expensive. Do you have any other kind? I want a cheaper one. W: What about this one? It's only 120 Yuan. M: OK. I'll take this one. Here is the money., Question: What is the relationship between the speakers? (A) Shop assistant and customer (B) Wife and husband (C) Waitress and customer.
(A) Shop assistant and customer