The Client Is on Strict Bed Rest Following Hip Surgery

The client is on strict bed rest following hip surgery. What nursing intervention would support vascular health?

A) Place pillows under the unaffected knee for support.
B) Keep the client in a prone position for at least 20 minutes twice a day.
C) Have the client alternately flex and extend the feet several times a day.
D) Position the bed to flex the knees at least 20 degrees.