What is the definition of 'braking distance'?

Braking distance refers specifically to the distance a vehicle travels from the moment the brakes are applied until the vehicle comes to a complete stop. This distance is influenced by various factors, including the vehicle's speed, road conditions, and the type of brakes used. Understanding this concept is essential for safe driving, as it helps drivers gauge how far they need to stop appropriately in different situations.

The other options mention related concepts, such as preparing to stop and reaction distance, but they do not define braking distance accurately. Hence, option B is the most precise definition, making it the correct choice.