Unhappy triad

A 33-year-old man presents to the emergency department following a right knee injury. The patient was playing rugby when an opposing teammate tackled him. He felt a “pop” in the right knee and experienced pain after that. The patient is otherwise healthy. Physical examination demonstrates a large right knee effusion, a positive anterior drawer test, and a positive valgus stress test. Vital signs are within normal limits. An MRI of the patient's right knee is shown below. Which of the following is the most likely mechanism of injury that resulted in this patient’s condition?
 
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