A runner runs for some distance before taking a long jump because the inertia of his body helps him cover more distance during the jump; option [C]. Running increases the momentum of his body, enabling him to generate more force and velocity, which translates into greater distance during the jump. Therefore, the correct option is [C] While jumping, the inertia of his body helps him to cover more distance. This strategy is commonly employed in long jump events to maximize the distance achieved, utilizing the momentum gained from running to propel the body further through the air during the jump. It optimizes the athlete’s performance by harnessing the principles of physics, specifically inertia, to enhance the effectiveness of the jump and achieve greater distances.