Research in Western Countries and Japan Shows What About the Effects

Research in Western countries and Japan shows what about the effects of violent video games on aggressive behaviour?

A) exposure to violent games is a causal risk factor on aggressive thoughts and behaviours
B) exposure to violent games is a causal risk factor on aggressive thoughts but not on behaviour
C) exposure to violent games is caused by previously established aggressive behaviour
D) exposure to violent games is a causal risk factor on aggressive thoughts and behaviours in Western countries but not in Japan
E) exposure to violent games is a causal risk factor on aggressive behaviours but not on aggressive thoughts