Where did the conversation most probably take place（）

A. To invite him to a cookout.
B. To ask if she can borrow his car.
C. To tell him about a trip she took.
D. To convince him to go on a canoe trip.

A．the man has never been to the library before, so he asks the librarian for help
B．it isn’t the first time for the man to ask the librarian to recommend books to him
C．the librarian is so kind-hearted as to recommend books to each subscriber
D．the man and the woman know each other very well