Ten-year-old Bradley is obese. He finds sedentary activities...

Ten-year-old Bradley is obese. He finds sedentary activities, such as playing video games and watching television, pleasurable, but his parents want him to get more exercise and be more active. Which of the following strategies would you suggest to Bradley's parents?
   
A Create a competition in which he will earn points for every hour of exercise he completes.
   
B Take away privileges, such as free play time, when he is inactive.
   
C Give him extra chores around the house when he is inactive.
   
D Reward him with tickets to the zoo or a baseball game for spending less time inactive.