Patients with ___ injuries complain of a "popping" sensation in the knee at the time of injury, followed by development of rapid onset hemarthrosis and a feeling of joint instability with weightbearing. Examination findings included laxity of anterior motion of the tibia relative to the femur.
a) Medial collateral ligament
b) Lateral collateral ligament
c) Anterior cruciate ligament
d) Posterior cruciate ligament