Which of the following examples is the best illustration of cognitive dissonance?

a. The cult member who admires the leader of his group and follows the leader without doubt

b. The teacher who reprimands a student who she feels could do much better academically

c. The soldier who receives orders from a superior that violate his personal moral beliefs

d. The librarian who dreams of returning to graduate school to become a professor

e. The student who gives up trying to master calculus because it seems too hard