A Nurse Is Assisting Diedrich,11 Years Old,who Is Steadily,although Reluctantly,learning

A nurse is assisting Diedrich,11 years old,who is steadily,although reluctantly,learning how to use a peak flow metre to monitor his asthma.Which of the following is an appropriate statement by the nurse?

A) "You should feel very proud for understanding and using your metre."
B) "Think of using the metre as one of your daily chores."
C) "Maybe you could make a game out of the daily use of your meter."
D) "It's too bad if you don't want to use the metre,it's just something you'll have to do."