Which of the Following Statements Is True of Nondiet Factors

Which of the following statements is true of nondiet factors that affect bone health?

A) Genes influence the mechanisms for absorbing and employing vitamin D.
B) At maturity, men have a lower bone density than women.
C) The production of the female hormone progesterone has a direct impact on bone mass.
D) The fracture rate reduces by half for women who lose 20 percent of their body fat after menopause.
E) The bones of smokers are more dense than those of nonsmokers.