As the Nurse Is Helping an 85-Year-Old Man to Stand

As the nurse is helping an 85-year-old man to stand and ambulate, he complains that he feels that he has lost all of his strength in the last several years and cannot do the things he could do when he was 80. The nurse's most informative response would be:

A) "An increase in testosterone will build your muscle bulk back to where it was when you were younger."
B) "As we age our muscle cells are lost and replaced by fat, which leads to loss of strength."
C) "Inactivity makes our muscles 'lazy' and they just won't do the work they used to do."
D) "Additional vitamins will build your strength back up in a few months."