A pondering physics student paces forward and backward. His motion is shown on the following graph of horizontal position x vs. time t.
Graph of x (in meters) vs. t (in seconds). The y-intercept is at (0,0), then x increases linearly from 0 m to 2 m over 4 s, stays constant at 2 m from 4 to 8 seconds, and then decreases linearly from 2m to 0 m between 8 s and 12 s.
Graph of x (in meters) vs. t (in seconds). The y-intercept is at (0,0), then x increases linearly from 0 m to 2 m over 4 s, stays constant at 2 m from 4 to 8 seconds, and then decreases linearly from 2m to 0 m between 8 s and 12 s.
What is the average velocity of the student between the times t=0 and t=12 s?
Choose 1

(Choice A)
12 m/s

(Choice B)
0 m/s

(Choice C)
- 0.17 m/s

(Choice D)
0.17 m/s