What Are Control Groups

Multiple Choice

What are control groups?

A) They are the groups of participants who receive the stimulus in an experiment.
B) They are the groups of participants who alter their behaviors when they know they are being studied.
C) They are the groups of participants who do not receive the stimulus in an experiment.
D) They are the groups of people who act as spectators in the experiment.
E) They are the groups of people who conduct the experiment.