D. The energy transfer he is experiencing is Gravitational potential to kinetic.
The bungee jumper possesses gravitational potential energy due to his position above the ground level (on a bridge).
As he starts accelerating towards a lake below, his gravitational potential energy will be converted into kinetic energy.
Thus, the energy transfer he is experiencing is Gravitational potential to kinetic.
Learn more about gravitational potential energy here: https://brainly.com/question/1242059
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