How does visual lead time correlate to defensive driving?

A. It leaves a driver/operator a way out through warning devices and the distance it takes light and sound to travel.
B. It gives law enforcement the responsibility to look ahead of the apparatus to know where to place traffic barricades.
C. It anticipates evasive maneuvers by calculating how long it will take traffic to move out of the way of a responding apparatus.
D. It anticipates evasive maneuvers by calculating stopping time based on apparatus speed and the distance of the traffic ahead.