Careth: Good afternoon. I"ve just joined the library. How many books can I take out Eunice: You can take two books, and keep them for ten days. If you haven"t finished, you can renew them. Careth: How do I do that ______ Eunice: No, you can telephone. Tell us the titles of the books, and the date they are due for return. Eunice: These two books have been lended.
选项：

A:Why can"t I keep them for a longer time
B:Must I visit the library
C:How much could I be fined
D:Can I lend them to my friends