In which situation is the acceleration of the car negative?
A) The velocity of a car was 75 km/h over 4 hours.
B) The velocity of a car reduced from 50 km/h to 35 km/h over one minute.
C) The velocity of a car increased from 40 km/h to 75 km/h over 15 minutes.
D) The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h.