Which scenario best describes motion? A. a toy train in position 4 on a number line.
B. a race track that is 100 meters long.
C. a ball rolling from point A to point B.
D. a student living 150 miles from Chicago.

c. a ball rolling from point A to point B

Explanation:

a is talking about the position of the train

b is talking about the length of the track

d is talking about the distance a student is from somewhere.

So from taking all these options out we are left with C because the ball is actually moving and when something moves it is in motion.