Which term represents the how rapidly a speed control governor will complete a corrective action as the result of a load change?

Correct Answer: Option C — Promptness

Promptness refers to the governor's ability to minimize the time required to initiate and complete a corrective action following a load disturbance. High promptness ensures the prime mover returns to the desired speed setpoint rapidly, minimizing transient speed deviations and maintaining operational stability of the machinery.