Delmar believes that he has been sent to earth to save mankind. He believes that women are evil and that any male who speaks to a female is doomed to be a slave. He often tells people of his grand plan to save males from the influence of females. Nothing one says or does can convince him that his ideas are absurd. Delmar's behavior best exemplifies _________.

A) hallucinations
B) waxy flexibility
C) delusions
D) catatonia