Acar traveled at a constant velocity of 70 mph from noon to 2: 00 pm. at 3: 00 pm the velocity of the car was 80 mph; and finally at 4: 30 pm the velocity of the car was 40 mph.

which statement accurately describes the acceleration of the car?

a) the car had a positive acceleration the entire time.
b) the car had a negative acceleration from noon to 2: 00 pm.
c) the acceleration of the car from 3: 00 pm to 4: 30 pm was zero
d) the car had a positive acceleration between 2: 00 pm and 3: 00 pm.