40 POINTS!! A bungee jumper who is about to jump has her energy stored entirely as gravitational potential energy. After jumping, she bounces up and down on the elastic bungee cord. What has happened to her initial gravitational potential energy when she reaches the bottom of this motion the first time after she jumps?
A. Most of her initial energy has been converted back to gravitational potential energy. B. Most of her initial energy has been converted to kinetic energy.
C. Most of her initial energy has been converted to potential energy stored in the bungee cord.
D. Most of her initial energy has been depleted due to friction and air resistance.