A 30-year-old emergency medicine trainee is reviewing a 65-year-old man after a fall. He has a displaced intertrochanteric fracture of the femur. Which measure is most important to reduce the risk of venous thromboembolism perioperatively?AAppropriate pharmacological thromboprophylaxis with LMWH plus mechanical methodsBAspirin alone for all patientsCEarly ambulation only without prophylaxisDNo prophylaxis is needed for lower-limb fracturesEHigh-dose vitamin KCheck my answer