​The Decline in the Rate of Cigarette Smoking in the United

​The decline in the rate of cigarette smoking in the United States can be traced to

A) ​a report from the U.S. Surgeon General that linked smoking with adverse health effects.
B) ​weather conditions in southeastern states that significantly reduced the tobacco crops.
C) ​the successful use of hypnosis by health psychologists to get people to stop smoking.
D) ​an agreement by movie producers and directors to stop portraying cigarette smoking.