A Hypnotist Is Putting on a Demonstration,and Your Friend Benjamin

A hypnotist is putting on a demonstration,and your friend Benjamin is thinking about volunteering.He is nervous because he is afraid to do things he would normally not do.What should you tell Benjamin,based on research into the effects of hypnosis

A)  People lose all personal control when under the effects of hypnosis. 
B)  Most people have a protective cognitive barrier that prevents them from doing things they consider unacceptable. 
C)  Hypnosis doesn't really work, so he shouldn't bother volunteering. 
D)  Sometimes people will do things under hypnosis that they would normally consider unacceptable.