Here's a problem to solve: Sam builds a ramp and lets a toy car roll down. Which describes the energy of the car as it rolls down the ramp?

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

- A: The kinetic energy and the potential energy both increase.
 
- B: The kinetic energy and the potential energy both decrease.
 
- C: The kinetic energy increases and the potential energy decreases.
 
- D: The kinetic energy decreases and the potential energy increases.
 