While option D represents someone who wants to do immoral things and doesnt care about others well-being, theres no proof that its because hes been dehumanized. Option C shows that the students were exposed to dehumanization and experienced it themselves, and it also shows that afterward, they began projecting that behavior onto the other inmates.
So because of the fact that option C shows exposure prior to immoral behavior, I think it is *Option C*
