Recall That Howard Leventhal and His Colleagues (1967)showed One Group

Recall that Howard Leventhal and his colleagues (1967) showed one group of smokers a film depicting the ravages of lung cancer,gave another group of smokers a pamphlet with instructions on how to quit smoking,and exposed a third group to both the film and the pamphlets.People in the last group reduced their smoking significantly more than people in the other two groups because people who only

A) received the pamphlets became afraid they couldn't follow the instructions.
B) received the pamphlets weren't sufficiently motivated to read them.
C) watched the film were not sufficiently frightened by it.
D) watched the film were too frightened to ask for a pamphlet.