A)
how far a vehicle travels, in ideal conditions, from the time the driver sees a hazard until his/her brain recognizes it.
B)
how long it takes a driver to physically hit the brakes.
C)
how far a drunk person can travel before coming to a complete stop in response to a hazard ahead.
D)
how far a driver will continue to travel, in ideal conditions; before he/she physically hits the brakes.