The Canadian National Longitudinal Study of Children and Youth Reported

The Canadian National Longitudinal Study of Children and Youth reported a positive correlation between punitive parenting and aggression in children. Because this is a correlation, it is possible that aggressive children may elicit punitive parenting, rather than parenting leading to aggression. However, the fact that if parents __________ suggests that it is something about the parenting.

A) became more punitive over the course of the study, then aggression levels increased
B) became more punitive over the course of the study, then aggression levels decreased
C) became less punitive over the course of the study, then aggression levels decreased
D) both a and c