The lines on the position-time graph shows the velocities of different vehicles. Which line represents a vehicle moving at a constant velocity?
A. D
B. B
C. A
D. C
![The lines on the positiontime graph shows the velocities of different vehicles Which line represents a vehicle moving at a constant velocity A D B B C A D C class=](https://us-static.z-dn.net/files/d77/1d27dee9956fc75164570440e9e348e1.png)