Which of the following injuries include instability of the knee with pain and swelling? A. groin strain B. hamstring strain C. ACL tear D. bone fracture Please select the best answer from the choices provided. A B D

C. ACL tear<br /><br />An ACL (anterior cruciate ligament) tear is a common knee injury that can cause instability, pain, and swelling in the knee joint. The ACL is one of the ligaments that help stabilize the knee, and a tear can result from sudden twisting or impact to the knee. This can lead to feelings of instability, as well as pain and swelling in the affected knee.