The college tenure system provides long-term job security for established professors, but at the same time prevents younger instructors from entering the system. But instructors are familiar with current teaching material and therefore may provide students with a better education. Thus, it is a shame that many students are unable to be taught by instructors who cannot find employment because of the tenure system.
Which of the following is an assumption made in the argument above?
(A) Most tenured professors do not make an effort to provide quality education.
(B) Most instructors are against the tenure system.
(C) University students generally prefer to be taught by instructors.
(D) Instructors have received their graduate degrees more recently than professors.
(E) Tenured professors are not familiar with current teaching material.