A Researcher Wants to Examine the Relation Between Viewing Television

Multiple Choice

A researcher wants to examine the relation between viewing television violence and behaving aggressively.He has participants decide whether they would prefer to view a violent or a nonviolent film,and subsequently records the number of aggressive behaviours they show in a competitive game.The researcher cannot legitimately make a causal statement based on his findings,because the study

A) lacks external validity.
B) lacks psychological realism.
C) is low on mundane realism.
D) lacks random assignment.
E) has no cover story.