The braking distance is...
A)the distance travelled from the moment the driver sees the obstacle until the vehicle is brought to a stop.
B)the distance travelled from the moment the driver sees the obstacle until they apply the brake.
C)the distance travelled from the moment the driver applies the brake until the vehicle comes to a stop.Correct
The braking distance is the distance travelled by the vehicle from the moment the driver applies the brakes until the vehicle comes to a stop. This distance depends on speed, the mass and load of the vehicle, the vehicle's condition, road conditions, and weather conditions (rain x2, snow or ice x10).
The reaction distance is the distance travelled by the vehicle during the reaction time. This distance depends on the reaction time and the speed at which the vehicle is travelling (the higher the speed, the more metres covered in the same time).
The stopping distance is the sum of the reaction distance plus the braking distance.
Therefore, the stopping distance is the distance travelled by the vehicle from the moment the driver perceives a hazard until the vehicle comes to a complete stop.