Driver a Is Cruising Along Enjoying the Autumn Colours

Multiple Choice

Driver A is cruising along enjoying the autumn colours. Driver B starts her car at the instant he passes her. Their velocities are shown as functions of time in the graph below. At what instants in time on the graph are drivers A and B side by side?

A) 0 s, 2 s
B) 0 s, 4 s
C) 2 s, 4 s
D) 2 s, 6 s
E) 4 s, 6 s