Muscle cells of athletes often have more mitochondria than the muscle cells of nonathletes. Based on this observation, it can be inferred that the muscle cells of athletes
A)have a smaller demand for cell proteins than the muscle cells of nonathletes
B)reproduce less frequently than the muscle cells of nonathletes
C)have nuclei containing more DNA than nuclei in the muscle cells of nonathletes
D)have a greater demand for energy than the muscle cells of nonathletes