Failure to bend the knees and lower the body until the surface of the legs at the hip joint is lower than the top of the knees describes squat past parallel. Thus, the correct option is A.
The exerciser lowers their hips till the tops of their thighs are parallel to the floor while keeping their lower back flat and their chest up in a proper parallel squat.
In fact, if your weight is distributed correctly and you maintain good posture during the movement, a full squat (below parallel) may actually produce more knee stability.
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