A 70-year-old woman undergoes elective total hip arthroplasty. She has no prior history of venous thromboembolism. Which prophylactic strategy is most appropriate to reduce her risk of postoperative deep vein thrombosis?AEarly ambulation alone without pharmacologic prophylaxisBAspirin 81 mg daily alone for 7 daysCLow-molecular-weight heparin for at least 10 to 14 daysDInferior vena cava filter placement preoperativelyEFull-dose warfarin with target INR 2.5 started 1 week preoperativelyCheck my answer