What is the purpose of ABS built into a car?

Answer: B — Prevent the brakes from causing the wheels to lock up

The purpose of Anti-lock Braking System (ABS) built into a car is primarily to prevent the brakes from causing the wheels to lock up during hard braking situations. When a driver applies the brakes forcefully, especially on slippery surfaces, there is a risk of the wheels stopping completely. This can lead to a loss of steering control, making it difficult for the driver to maneuver around obstacles or stop safely. ABS works by sensing the speed of the wheels and rapidly pulsing the brake pressure to each wheel, which helps maintain traction and allows the driver to retain steering control. This technology is crucial for enhancing safety, particularly in emergency braking situations where every fraction of a second counts. While some features of the braking system may contribute indirectly to other aspects mentioned, such as warning systems or wear on brake components, the primary and most significant function of ABS is to prevent wheel lock-up, thereby improving vehicle safety and control during braking.