After a Knee Replacement, an 87-Year-Old Patient Rejects the Use

After a knee replacement, an 87-year-old patient rejects the use of the continuous passive motion (CPM) machine, saying, "I did not march when I was a child, and I am not marching now." What benefits of CPM should the nurse point out to encourage patient use?

A) Decrease in pain
B) Increase in circulation in the new joint
C) Increase in leg strength
D) Increase in flexibility for the new joint