Question

Las alumnas no tienen____libros

Answer 1

"Los" I think I mean u didn't give any options.

Answer 2

Las alumnas no tienen los libros 

You would put LOS instead of LAS because "books" is in the masculine form! The English language doesn't really have masculine forms of "the" but, it is a very important detail in Spanish classes, and if you don't pay attention your teacher can mark you off points! 

One thing that helped me out in Spanish was spanishchecker.com 

Hope this helps!