Which Prescription Is the Most Important to Decrease the Risk

Which prescription is the most important to decrease the risk of deep vein thrombus in a patient after surgery?

A) 1,000-calorie regular diet
B) Incentive spirometry every 2 to 4 hours
C) Increase fluid intake to 1,500 to 2,000 mL/day
D) Ambulate every 2 to 4 hours