In the Ridgewood Elementary School, Teachers Earn an Average of $40,000

Multiple Choice

In the Ridgewood Elementary School, teachers earn an average of $40,000, while librarians earn $32,000 per year. However, the average salary for Ridgewood employees is only $25,000.
If the above information is correct, then which of the following must be true?

A) There are more librarians than there are teachers.
B) At least one Ridgewood employee earns less than $25,000.
C) At least one teacher earns less than the average salary of a Ridgewood librarian.
D) At least one librarian earns more than the average Ridgewood teacher.
E) Only half of Ridgewood employees are librarians or teachers.