听力原文：Hi, Washington, this is Carl speaking. Have you finished reading the book that I

lend you a month before？ The book is borrowed from my cousin. He borrowed the book from our college library and had to return it before this Saturday, September 15. If it is convenient, would you like to return the book for him to the library？ If you are busy, you can contact me. Sorry to disturb, thank you.

Why does Carl call Washington？

A．To ask him to return the book on time

B．To ask him to borrow a book from his cousin

C．To ask him to borrow a book from the library

D．To ask him to contact with him