To determine where a roller coaster's kinetic energy is highest, we need to understand that kinetic energy is dependent on speed. The kinetic energy of the roller coaster is highest at the points where it is moving the fastest.
Typically, this would be at the bottom of a drop or the lowest point of a hill. So, if the points A, B, C, and D correspond to different locations on the roller coaster track, the highest kinetic energy would likely be at the lowest point of the track.
If you can specify the locations A, B, C, and D or provide a diagram, I could give a more detailed answer.
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