A child who lives down the street from you knows you are taking a class on physical fitness and has asked for some advice. He is only 11 years old now, but he wants to plan for a healthy future. His question to you is whether he should worry about his bone strength now or when he is in his 40s or 50s. What should you tell him?
A- Bone development takes place when you are a teen, so get ready to build strength now.
B- Bone development has already occurred, so if you have not been strengthening, it is too late.
C- Bone development will happen when you are 35 or 40, so you should wait until then.
D- Bone development occurs at different points in everyone's life, and it's impossible to predict.