A、At a store. B、At a bank. C、At a post office. D、At an airport. C

M: I can come to your house and pick you up in half an hour. Is that all right?
W: Good. That means you’ll be here at seven-thirty.
Q: What time is it now?

M: I need eight stamps and I’d like to send this parcel by air mail.
W: Here are your stamps, but you have to take the parcel to the next window.
Q: Where does this conversation most probably take place?