In a Public Library, One of the Duties of a Librarian

Multiple Choice

In a public library, one of the duties of a librarian is to acquire books library patrons will find enjoyable and important. It goes without saying then that acquiring the most popular works is part of a librarian's job.
Which of the following is an assumption made by the passage above?

A) Library patrons will not be satisfied unless librarians acquire only works of important, groundbreaking literature.
B) Library patrons will find at least some popular works to be enjoyable and important.
C) Library patrons will not be satisfied unless their library carries all current popular works.
D) The work of a librarian is still essential for modern day libraries.
E) There are no books that are both popular and important.