The nurse teaches the mother of a young child with Duchenne's muscular dystrophy about the disease and it's management. Which of the following statements by the mother indicates successful teaching?
a. My son will probably be unable to walk independently by the time he is 9 to 11 years old.
b. Muscle relaxants are effective for some children; I hope they help my son.
c. When my son is a little bit older, he can have surgery to improve his ability to walk.
d. I need to help my son be as active as possible to prevent progression of the disease.