Randall's Doctor Said He Would Like to Start Measuring His

Multiple Choice

Randall's doctor said he would like to start measuring his lung capacity. Now that Randall is 55 years old, it is likely that:

A) his lung capacity has been declining through middle adulthood.
B) the proteins in his lungs are becoming more elastic.
C) the connective tissues in his chest wall are getting flexible.
D) his lungs will become less efficient at getting oxygen to his brain.