What do bisphosphonates, calcitonin, evista, fosamax, forteo, and boniva have in common?

a. they are drugs or hormones used to prevent osteoporosis

b. they are antioxidant enzymes

c. they are other names for phosphates, calcium and iron supplements

d. they are used to help prevent hyponatremia when exercising in the heat

e. they are drugs used to help prevent pernicious anemia?