When Driving on the Freeway,you Notice That the Bushes at the Side

Multiple Choice

When driving on the freeway,you notice that the bushes at the side of the road appear to be passing very quickly.In the distance you can see a very tall tree,and you notice that it takes half an hour to drive past it.What depth cue is causing this speed discrepancy?

A) motion parallax
B) compensatory movement
C) stroboscopic movement
D) changes in linear perspective