She is

kilometers away from her starting point
That would be called VOLT
The gravitional potential energy, relative to the bottom of the giant drop, in joules, is (9800) times (the height of the drop in meters).
That's the PE of the empty car only, not counting any hapless screaming souls who may be trapped in it at that moment.
Answer: I would say the answer is B.
Explanation: It looks and sounds the most correct.