The stopping distance is the distance travelled by the vehicle...
A)from the moment the driver brakes until the vehicle comes to a stop.
B)during the time that passes from the moment the driver reacts until they press the brake pedal.
C)from the moment the driver perceives a hazard until the vehicle comes to a stop.Correct
The stopping distance is the sum of the reaction distance plus the braking distance.
Reaction distance: This is the distance the vehicle travels from the moment the driver perceives a hazard until they react, for example by pressing the brake pedal.
Braking distance: This is the distance the vehicle travels from the moment the driver brakes until the vehicle comes to a stop.
Therefore, the stopping distance is the distance the vehicle travels from the moment the driver perceives a hazard until the vehicle comes to a stop.