Response:
C) the third-variable criterion
Rationale:
In this context, the variables of interest are children's exposure to television and their corresponding levels of aggression. The independent variable is the children's exposure to television, while the dependent variable is the child's aggression.
Nevertheless, you are questioning whether another factor, peer pressure, influences these two variables. When a separate variable affects two other variables, it is referred to as the third-variable criterion. Thus, I focus on the third-variable criterion.
