Every library has books.

The correct answer is C. No library is without books.

A. Books are only in library. This is not always true. Books can be found in many other places, such as bookstores, homes, and schools.
B. Libraries are meant for

books only. This is also not always true. Libraries can also contain other materials, such as magazines, newspapers, and DVDs.
D. Some libraries do not have readers. This is true, but it does not mean that the library does not have books. It simply means that the books are not being checked out by readers.
E. Two-fifth of the boys play only football. This is not related to the question about libraries.

The statement “Every library has books” means that all libraries have books. This is true because libraries are places where people can go to borrow books. If a library did not have books, it would not be a library.