You are seeing a 19-year-old who suffered a knee injury playing soccer one day ago. The injury involved a sudden deceleration in which she planted her right foot in front of her while running, whereupon another athlete fell against her shin. She felt a pop and sudden pain. She had to be helped off the field and her knee swelled immediately. Today, she reports that she has considerable right knee pain with bearing weight and that her knee feels unstable at times. Her past medical history is unremarkable, and she takes no medications. On exam, her vital signs are perfectly normal. You conduct a knee exam. Which of the following exam maneuvers is most likely to be abnormal in this patient? A. Lachman test B. Laxity to valgus stress C. Laxity to varus stress D. McMurray test E. Posterior drawer test