To Improve Venous Blood Return from the Legs Postoperatively,which of These

To improve venous blood return from the legs postoperatively,which of these exercises will be MOST beneficial to the client?

A) turning from side to side at regular intervals
B) splinting incision when coughing
C) deep breathing and making circles with the ankles
D) pushing toes toward the foot of the bed until calf muscles tighten,then relaxing and pulling toes toward chin until calf muscles tighten,then relaxing again