In One Study, One Group of College Students Were Hypnotized

In one study, one group of college students were hypnotized while another group pretended to be hypnotized. What did some of the hypnotized subjects do that none of the pretenders did?

A) report puzzlement at seeing the same person in two places at once
B) tolerate sharp pain
C) make themselves stiff enough to balance their head on one chair and their feet on another
D) show signs of anger or other emotions when instructed to feel them