Which Finding Provides the Clearest Evidence for the Hypothesis That

Which finding provides the clearest evidence for the hypothesis that watching TV causes stereotyping?

A) Children in a town that had no access to TV showed an increase in stereotypical views following the introduction of TV.
B) Boys hold more stereotypical views than do girls.
C) Older children, who watch more TV than younger children, hold more stereotypical views than younger children do.
D) Children who watch more cartoons hold more stereotypical views than do children who watch fewer cartoons.