单项选择题

W: What can I do for you.Sir
M: Yes.I bought this radio three days ago.but it doesn’t work now.I’d like to exchange it for another one.
W: Oh, dear.I’m very sorry for this.Have you got the receipt
M: Yes.hereitis.
W: Ok.Just a moment.please.

Where does this conversation take place().

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

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