W: Can I help you
M: Yes. I bought this radio two days ago, but I’m afraid it doesn’t work. I’d like to change it for another one.
W: Oh, dear. Yes, of course. Have you got your receipt
M: Yes, here it is.
W: Thank you. Just a moment, please.

Where does this conversation take place()

A. In a store
B. In a factory
C. In a museum.