In an experiment, what is the difference between a control variable and an independent variable?

In an experiment, what is the difference between a control variable and an independent variable?

• A. The independent variable is kept constant, and the control variable is deliberate change.
• B. The independent variable is deliberately changed by the experimenter; the control variable is kept constant to ensure a fair test.
• C. Both are changed at the same time.
• D. Only the control variable affects the outcome.

Answer: (B)