A researcher wants to set up a study to test the effects of a new energy drink on student alertness. How would the researcher use a control group?
A. The control group would be assigned to drink the new energy drink.
B. The control group would be assigned to drink plain water.
C. The control group would alternate between the new energy drink and plain water.
D. The control group would not drink the energy drink or water.
Answer: D
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