Among the Following, Which Conclusion Has Not Been Drawn Based

Among the following, which conclusion has not been drawn based on laboratory experiments studying pornography and aggression?

A) Exposure to nonviolent pornography decreases subsequent aggression in the lab.
B) Exposure to violent pornography increases subsequent aggression in the lab.
C) Exposure to dehumanizing, nonviolent pornographic images of women affects men's attitudes regarding sexual aggression toward women.
D) Exposure to violent pornography decreases subsequent aggression in the lab if the women in the pornography are depicted as passive.