In an experiment, a control group is different from an experimental group in that the people in the control group:
are not exposed to the same treatment of the independent variable.
differ in trait variables.
do not incur the same exposure to the dependent variable.
believe they are part of the experimental group.
I chose A. Am I right?
Yes, you are right.
thank you
An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.
A dependent variable is the response or measure of results.
Extraneous variables — other than the independent variable — potentially can affect the dependent variable, so they must be controlled. If possible, you try to keep them constant between the experimental and control group.
The experimental group receives the independent variable.
The control group is similar to experimental, except it does not receive the independent variable. Extraneous variables are balanced between experimental and control groups.