Research on the Effects of Violent Videogames on Aggression Demonstrates

Research on the effects of violent videogames on aggression demonstrates that the effects of such games on aggression are

A) much less than the comparable effects of aggressive television, since the game itself gives children an outlet.
B) significant, but only for those children who were shown to be more prone to violence beforehand.
C) significant, but the effects are due to the correlation of aggression with income.
D) significant, and a causal as well as a correlational relationship has been demonstrated.