Which of These Messages Is Best for Motivating Adolescents to Eat

Which of these messages is best for motivating adolescents to eat a healthy diet?

A) "Eating well will give you energy for sports or social activities."
B) "Eat what you don't like because it's good for you."
C) "Eating well may prevent heart disease in the long term."
D) "Eat well now so you won't be frail or disabled when you are old."