In the Crum and Langer Hotel Experiment

In the Crum and Langer hotel experiment:

A) all the participants were told that the experimenters were interested in getting information on their health so that they could study ways to improve it.
B) half the participants were given the health supplement ginkgo biloba and the other half were given a placebo.
C) all the participants were told that the experimenters were interested in getting information on the working conditions at hotels so that they could study ways to improve safety and reduce injuries.
D) half the participants were led to believe they were in "poor" physical condition and half were led to believe they were in "excellent" physical condition.