Consider an experiment in which subjects are given a pill to test its effectiveness in reducing the duration of a cold. Which of the following is the best way to treat the control group? (a) Give the control group two pills instead of one. (b) Do nothing with the control group. (c) Give the control group a pill that looks like the test pill but does nothing. (d) Let the control group choose whether or not to take any pills. (e) Expose the control group to the cold virus.

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