Children of active mothers are twice as likely to be active as children of inactive mothers. What is TRUE regarding fathers?

a. Father activity level is unrelated to child activity level.
b. As the father's activity increases, the child's activity level decreases.
c. Children of active fathers are 3.5 times more likely to be active.
d. The father's activity level is related to the activity level of boys, but not that of girls.

c