The correct answer is C. lent.
The library expects you to return each and every book that you have borrowed. When you borrow a book from the library, you are essentially taking it on loan. This means that you are responsible for taking care of the book and returning it in good condition. If you do not return the book, you are considered to have stolen it.
The other options are incorrect because they do not accurately reflect the relationship between the library and the borrower. Option A, demanded, is incorrect because the library does not demand that you return the books. Option B, taken, is incorrect because you do not take the books from the library; you borrow them. Option D, handed, is incorrect because you do not hand the books to the library; you return them. Option E, given, is incorrect because the library does not give you the books; you borrow them.