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Why it is important to have a control group within a study examining the effectiveness of a particular drug?
a. To compare the control group's baseline (everyday) behavior to the behavior of people receiving the drug
b. Since the experts from the control group can ensure that the study is conducted in an ethical way.
c. Since the experts from the control group can reverse the side effects of the drug.
d. Since the experts from the control group ensure that all aspects of the study are conducted optimally