The Distance Traveled by a Car in the X-Direction Is

Multiple Choice

The distance traveled by a car in the x-direction is shown.When the car changes speed for t = 10 s to 15 s,it does so uniformly.Use the graph below to answer question.
-The acceleration of the car between 10 s and 15 s is

A) 1 m/s²
B) 2 m/s²
C) 3 m/s²
D) 4 m/s²
E) 5 m/s²