In Childhood, Bones Are Built at a Faster Rate Than

In childhood, bones are built at a faster rate than the rate at which they break down.However, after age 30, the process begins to reverse; bones lose minerals and break down faster than they are built.Some aging people, with especially low bone density, are at risk for:

A) osteoclorosis.
B) osteoporosis.
C) ossification.
D) None of these choices.