Student: How long can I have these books？Librarian: This one is on the three－hour－loan;

Student: How long can I have these books？

Librarian: This one is on the three-hour-loan; you may have it for only three hours ______.

A: The others are due in 30 days, on February 3.

B: You may have it longer if you like.

C: Drop the books into the RETURN boxes by the library entrance.

D: The fine for overdue books is 5 dollars an hour.