In Combination, the Ginkgo Biloba Experiment and the Hotel Experiment

Multiple Choice

In combination, the ginkgo biloba experiment and the hotel experiment demonstrated that:

A) people's beliefs and expectations can have a significant influence on behavior and well-being.
B) demand characteristics and expectancy effects contributed to the main effects in both studies.
C) taking ginkgo biloba in combination with exercise has proven health benefits.
D) housekeeping work in most hotels is unhealthy and contributes to physical ailments such as chronic back pain, but that ginkgo biloba can help prevent such illnesses.