A researcher shows a violent film to one group of participants and a nonviolent film to another before giving both groups a test measuring aggressiveness. Which of the following statements is true?
A. The participants shown the violent film are the control group.
B. The type of film shown is the independent variable.
C. The nonviolent film is likely to produce a placebo effect.
D. The violent film is a confound.
Answer: B
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