Which of the following exercises primarily involves the biceps?

The low cable row primarily involves the biceps because it is an exercise that requires the arms to pull a weight towards the body while maintaining a bent elbow position. This pulling motion engages the biceps brachii significantly, as they are responsible for flexing the elbow joint and pulling the forearm towards the upper arm. In addition to the biceps, the low cable row also engages the muscles of the back, including the latissimus dorsi, but the focus on pulling with the arms emphasizes bicep involvement.

In contrast, the military press primarily targets the shoulders and triceps, the bench press focuses on the chest, shoulders, and triceps, and dips mainly work the triceps and chest, with some shoulder involvement. None of these options engage the biceps to the same degree as the low cable row, making it the exercise that primarily involves the biceps.