Conducted a Study in Which He Told College Students During

conducted a study in which he told college students during a demonstration that hypnotized participants usually experience stiffening of the muscles in the dominant hand,even though this rarely occurs.When students who had heard this were later hypnotized themselves,55 percent of them showed hand-stiffening,while the percentage of the participants in a control group who knew nothing about hand stiffening was ___________ percent.

A) five
B) one
C) zero
D) twenty-five