An athlete executes a high jump over a horizontal crossbar. During free flight, the only external force acting on the athlete is gravity, and air resistance is negligible. To clear the bar, the athlete dynamically arches their body so that their torso's vertical displacement relative to their center of mass reaches a maximum at the peak of the jump. Which of the following correctly describes the qualitative shapes of the trajectory curves, \(y(x)\), and compares the magnitudes of their curvatures at the apex for the athlete's center of mass and torso?