Arthur Patterson (1974)studied the Hostility Levels of High School Football

Arthur Patterson (1974) studied the hostility levels of high school football players both one week before and one week after the football season.If engaging in socially acceptable aggressive behaviour like football reduces hostility,then the players' level of hostility should have

A) increased on the football field, but decreased in classes.
B) been dependent on personality variables.
C) increased over the duration of the playing season.
D) remained the same over the duration of the playing season.
E) decreased over the duration of the playing season.