Kinetic energy is the energy of motion. As Kendra rolls down the hill, her potential energy (due to her height) is converted into kinetic energy (due to her motion). As she descends, her height decreases, and her kinetic energy increases.
The kinetic energy is highest when she is moving the fastest. This typically occurs at the bottom of the hill, where she has converted most of her potential energy into kinetic energy.
Therefore, the correct answer is:
A At the bottom of the hill, right before she stops rolling.