A、At a library. B、In a bus. C、At the airport. D、At a post office. D

M: I think I’ll run down to the bookstore and get a few things.
W: But aren’t we going to meet Sally at the student center?
Q: What does the woman mean?

M: I need a book of stamps and I’d also like to send this package first class.
W: Here are your stamps, but you have to take packages to the next window.
Q: Where does the conversation probably take place?