88 points answer fast

at 9: 00 am a car was driving down the highway at a constant velocity of 60 mph. at 9: 30 am the car entered a speed zone and started going 40 mph. at 10: 00 am the driver got stuck in traffic and had to slow down to only 25 mph. at 10: 30 am the driver reached his destination. which statement about the car's trip is correct?

a. the car had a positive acceleration the entire time.

b. the car experienced negative acceleration from 9: 30- 10: 00.

c. the acceleration of the car from 10: 00-10: 30 was zero.

d. the car did not accelerate during the trip.