Bone depletion -- decreases in the thickness, density, and strength of bones -- tends to occur as humans age. The bones of some individuals seem to become thicker, denser, and stronger with regular weight-bearing exercise, such as weight lifting, and with the intake of dietary calcium.
Which of the following can be correctly inferred from the statements above?
A. Individuals who eat sufficient calcium run no risk of bone depletion in old age.
B. Individuals who do not undertake weight-bearing exercise have a high risk of experiencing bone depletion late in life.
C. Weight-lifting and intake of dietary calcium are the most effective methods of avoiding bone depletion.
D. A program of regular weight-bearing exercise and intake of dietary calcium allows some individuals to avoid one of the deleterious effects of aging.
E. Only weight-bearing exercise is necessary to build bone thickness, density, and strength