During a squat, the primary joints involved are:

The correct choice focuses on the specific joints that play a significant role in the mechanics of a squat. During a squat, the primary joints involved are indeed the hip and knee.

When performing a squat, the hip joint allows for flexion and extension as you lower and raise your body, while the knee joint is crucial for bending and straightening during this movement. The actions at both of these joints work in conjunction to enable the proper execution of the squat, which is essential for strength training and functional movement.

The other options involve joints that do not play a primary role in the squat. For example, the shoulder and elbow are more involved in upper body movements, while the ankle contributes to stability but is not a primary joint like the hip and knee. The wrist, while also important for grip and overall stability in different contexts, is not activated significantly during the standard squatting motion. Therefore, focusing on the hip and knee provides a clear understanding of the biomechanics at play during a squat, making this choice the best answer.