What is the primary function of anti-lock brakes (ABS)?

Answer: B — To prevent wheel lock-up during hard braking

The primary function of anti-lock brakes (ABS) is to prevent wheel lock-up during hard braking. This technology allows the driver to maintain steering control while braking heavily. When a driver applies the brakes forcefully, ABS automatically modulates the brake pressure to prevent the wheels from locking up, thereby permitting the driver to steer around obstacles effectively. This is particularly crucial in emergency situations, as it significantly enhances vehicle control and stability, ultimately improving safety on the road. In regards to the other options, while improving fuel efficiency might be a concern for various vehicle technologies, ABS does not serve this function. Similarly, enhancing traction on wet roads is more associated with tire design and tread patterns than with the braking system itself. Lastly, reducing tire wear can be a side benefit since ABS can lead to less skidding, but it is not the primary purpose or design of the system. The main advantage of ABS lies in its ability to allow drivers to brake safely and maintain control of the vehicle under challenging conditions.