Since air resistance is being ignored, there is no force in the horizontal direction. Therefore, the component of the particle's velocity is constant. We are told that the stone is thrown in the direction. Therefore, the component of the velocity must be positive. Therefore, graph II represents versus . The component of the particle's velocity vector is initially positive, but it decreases at a constant rate due to the force of gravity, and eventually becomes negative. Therefore, graph III represents versus . Therefore, answer (C) is correct.
