Bones of Trained Athletes May Be Visibly Thicker and Heavier

Multiple Choice

Bones of trained athletes may be visibly thicker and heavier than those of nonathletes because

A) athletes have lower blood calcium levels than nonathletes.
B) weight-bearing exercise increases bone mass and strength.
C) nonathletes have a low parathyroid hormone rate.
D) athletes produce more growth plates.
E) nonathletes produce fewer osteoids.