A、Lawyer and client. B、Student and teacher. C、Shop assistant and customer. D、Manager and employee. CWhat’s the probable relation

M: Will you please show me that notebook?
W: Certainly.
M: How much is it?
W: Twenty-one yuan and fifty fen.
M: Hm. It’s certainly nice, but it’s a bit more than I was thinking of paying. I don’t think I’ll take it.
W: How about that size? It’s also very good and much cheaper.
M: Let me see one.
W: This size is ten yuan and ninety fen.
M: That’s very reasonable. I’ll take it then.