Here's a problem to solve: A student slides an object down a ramp. The student states that friction is causing the object to slide slowly. Another possible explanation for the slow movement is that the

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

- A: incline of the ramp is small.
 
- B: surface of the ramp is smooth.
 
- C: object is round and polished.
 
- D: pull of gravity on the object is weak.
 