Which of the following scenarios best exemplifies a violation of academic freedom?
A. A professor disagrees with a university policy and discusses it with colleagues.
B. A student group protests a controversial speaker's invitation to campus.
C. A university cancels the contract of a lecturer teaching a course on 20th Century literature after students complain that the lecturer includes a book in which the protagonist uses racial slurs.
D. A professor presents well researched evidence challenging a widely accepted theory.
E. A university restricts a student publication that criticizes the university administration.