Students are asked to describe the motion of a person on a ride in an amusement park based on the graph below.

Which description matches the graph?

A

Student One states that the person is gaining speed at a constant rate for the first two seconds since the slope is positive. He moves at a constant velocity between two seconds and five seconds, and again between eight seconds and ten seconds. At five seconds, the person slows down until the seven second mark and then gains speed going backwards for one more second.

B

Student Two states that the person moves forward at a constant speed for the first two seconds; stands still for three seconds; moves backward past the starting point for three seconds and then stands still again.

C

Student Three states that the person moves forward from zero to seven seconds when the area is positive and moves backwards from seven to ten seconds when the area is negative.

D

Student Four states that the person gains speed from zero to seven seconds when the area is positive and slows down from seven to ten seconds when the area is negative.