What Is the Primary Reason to Include a Control Group

What is the primary reason to include a control group in an experiment?

A) The control group provides feedback about the experimental group.
B) The control group is ready to take the experimental treatment in case the experimental group does not work out.
C) The control group allows you to make comparisons to the experimental group.
D) The control group maintains control over distributing the treatment to the experimental group.

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