D. I don't know if that is what your teacher will agree with but in my own personal research I have found that to be very effective.
That is because even you don't weigh that much, you can still become easily ill due to high cholesterol or high blood pressure or any other obesity related illnesses because of the more than allowed percentage of body fats.
B. Appositional growth. This happens when the bone breaks. It repairs itself through this process.
The others are specific parts of the bone.
A. Metaphysis is where the growth plates are between the end of the bone and the shaft.
C. Diaphysis is the shaft of the bone.
D. Epiphysis is the ends of the bone.
