In order to study the effects of watching violent programs on children's aggressiveness, a researcher observes children's behavior after they watch 30 minutes of violent programs on television. The researcher concludes that television violence causes aggressiveness. A problem in this research is that
A. the children's behavior is not observable.
B. there is no independent variable.
C. there is no control group.
D. the researcher should have had the children watch at least 60 minutes of violent programs on television.
Answer: C
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