Which Finding Provides Evidence That the Pleasant Effects That Recently

Which finding provides evidence that the pleasant effects that recently abstinent smokers experience when they smoke a cigarette may be caused by relief from withdrawal?

A) If these recently abstinent smokers continue to smoke the pleasant effects decrease.
B) If these recently abstinent smokers continue to smoke the pleasant effects increase.
C) When nicotine is administered to nonsmokers they experience they tend to experience the same positive effects.
D) When nicotine is administered to nonsmokers they experience they tend to experience negative effects.