Pete's doctor has advised him to change his diet in order to lose 15 pounds at a rate of about 1/2 pound a week. To accomplish the weight loss, Pete must
A. eat slowly and skip at least one meal per day.B. eat snacks whenever he's hungry, rather than three full meals per day.C. decrease his calorie intake by about 500 calories per week.D. decrease his calorie intake by 250 calories a day.