Answer:
The answer is: B) User
Explanation:
In this specific case the students can be both only final users of your products (books) or they can also be the buyers/users of the books. They are obviously going to be the product’s end-users. They will need to read and study the books for their university classes.
That doesn´t necessarily mean that they are going to buy the books. They definitely are not going to decide whether those books are appropriate and useful for the university´s courses or not. When I went to college sometimes our professor told us to buy certain books and other times textbooks were given to us.