Answer: D) calcium and vitamin D
Osteoporosis is a medical condition that forms several pores along the bones, causing them to be more absorbent and more prone to fractures. This condition is more common amongst women who are experiencing menopause, although it also happens as a result of other causes such as smoking habits, obesity, aging, and so on.
This condition is caused by a deficiency in calcium and vitamin D, and as such, adequate intake of calcium and vitamin D will help prevent the bones from being brittle.
Calcium is essential for building strong bones and teeth, and vitamin D are essential for the absorption of calcium from food.