In Their Research on Self-Perception Theory,what Did Storms and Nisbett

In their research on self-perception theory,what did Storms and Nisbett (1970) find was an effective treatment for insomnia?

A) asking people to reflect on the reasons why they have insomnia
B) asking people to visualize themselves sleeping
C) giving people a placebo pill that they were told would cause arousal as they went to sleep
D) giving people a placebo pill that they were told would relax them and help them sleep