Andrew feels good about himself. he doesn't know exactly why he is so happy, but every day he looks forward to his schoolwork and chores. "i play a game," he says. "i make a list of everything i have to get done, and then i try to finish it all before a certain time. for some reason, i feel great when i beat my time." based on this information, why is andrew happy?
a. he gets a proper amount of sleep
b. he eats healthy meals
c. he has a strong family support group
d. he regularly meets his own goals