阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Lack of parent willpower may contribute more to juvenile obesity than under-exercising or overeating.
Research suggests that having overweight parents is a big influence upon a child’s weight, with one study finding that children with overweight parents were four times more likely to be overweight themselves.
