Here's a problem to solve: A car is rolling on a level street. What can make the car stop moving?

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

- A: a force that pushes straight up
 
- B: a force that pushes straight down
 
- C: a force that pushes the same direction that the car is moving
 
- D: a force that pushes the opposite of the direction that the car is moving
 