Which of the Following Is NOT a Reason Why Children's

Which of the following is NOT a reason why children's physical aggression decreases across the preschool years?

A) As children improve their cognitive skills, they are less frustrated and are therefore less likely to act aggressively.
B) As their egocentrism declines, children are increasingly able to understand other children's thoughts and feelings.
C) Children come to understand that prosocial, altruistic behaviour will accomplish their desires more effectively than aggressive behaviour.
D) The development of dominance hierarchies and the corresponding knowledge of each other's place in the pecking order serve to reduce physical aggression.