Which component provides the key input for the ABS control module?

The correct choice is the wheel speed sensors, as they play a crucial role in providing real-time data to the ABS (Anti-lock Braking System) control module. These sensors monitor the rotational speed of each wheel, allowing the ABS system to determine whether any wheel is about to lock up during braking. By continuously assessing this information, the ABS control module can make instantaneous adjustments to the brake pressure applied to each wheel, helping to prevent skidding and maintaining vehicle control during emergency braking situations.

While other components like the brake pedal sensor, hydraulic pressure sensor, and traction control module offer valuable data for various vehicle functions, it is the wheel speed sensors that are specifically tasked with feeding the ABS control module the essential input it requires to effectively manage braking activities and ensure safety.