Here's a problem to solve: An engineer must calculate the potential energy of a roller coaster car at the top of an incline. Which information would best help the engineer determine the potential energy of the car?

Among the 4 following options, which is the correct answer?

- A: the distance the roller coaster car must travel
 
- B: the mass of the roller coaster car at full capacity
 
- C: the average weight of an empty roller coaster car
 
- D: the direction that the roller coaster car is traveling
 