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

A) fear was aroused and they were provided a means to reduce that fear.
B) they were relatively light smokers.
C) the combination increased their confidence in their ability to quit.
D) prior to the study,they reported more failed attempts to quit.