A Student Has Learned About Aging and the Musculoskeletal System

A student has learned about aging and the musculoskeletal system. What statement by the student indicates a need for more study on the topic?

A) Haversian system erodes, the canals nearest the marrow cavity widen, and the endosteal cortex converts to spongy bone.
B) The remodeling cycle increases because of a decreased ability of the basic multicellular units to resorb and deposit bone.
C) Cartilaginous rigidity increases because of decreasing water content and decreasing concentrations of glycosaminoglycans.
D) Muscle ribonucleic acid (RNA) synthesis declines, although the regenerative function of muscle tissue is reportedly normal in older adults.