What Is the Essential Difference Between a Control Group and a Comparison

What is the essential difference between a control group and a comparison group?

A) A control group is used in interventional research. A comparison group is used in non-interventional research.b.A control group is larger in size than a comparison group.
C) A control group exists only in a basic lab situation. All nursing studies use comparison groups.
D) A control group controls for the effects of potential extraneous variables. A comparison group does not.

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