Tameka is interested in studying the hypothesis that forming new memories is associated with an expenditure of energy. Which research design would provide the most thorough examination of her hypothesis?
A. Recording if she feels tired after studying.
B. Asking 50 people to record their energy level before and after studying.
C. Observing 50 people to see if they look tired after taking a test.
D. Asking her friends about their energy levels after taking an exam.
Answer: B
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