听力原文：M: Excuse me. Would you happen to know where the post office is? I was told that it was around here somewhere, but I can't seem to find it.
W: The post office you're looking for used to be right here next to the stationery store, but it moved to the corner of Sunset Road and Elm Street a couple of weeks ago. If you want to go there, just walk straight down this road until the next intersection. Turn right, and walk two blocks until you see the brown building on the northwest corner.
M: Thanks a lot. And, would you happen to know what time it closes, by the way? I heard the closing time is at 4 o'clock.
W: As far as I know, they're open until 4:30. Yes, I'm sure they are open now. I was there the other day, and t remember looking at my watch. It was 4:20 at the time.
Where is the conversation taking place?
A．In a stationery store.
B．In a post office.
C．On a street.
D．At city hall.