Osteoporosis is the correct answer I think
People get Chicken pox just by contact. It is a contagious disease in other words, an air borne disease.
Menopause happens because of a DECREASE in the ovaries' production OF the hormones ESTROGEN and progesterone.
I would say b., mostly because it is good to have them know why they need to act in such a manner not just the "style" of which the behavior is being done. Sometimes it is difficult for them to refine their behaviors, but it can produce progress
