What type of flight control is characterized by its auxiliary function and assists in moving a control surface?

The type of flight control characterized by its auxiliary function that assists in moving a control surface is indeed an auxiliary control. These controls are not the main controls responsible for aircraft movement but serve to enhance or support the primary controls. For instance, flaps and slats are examples of auxiliary controls that help manage lift and drag during various phases of flight. They provide additional aerodynamic efficiency and stability, which are crucial for improving aircraft performance during takeoff and landing.

Primary control surfaces, on the other hand, directly influence the aircraft's pitch, roll, and yaw. Secondary controls typically refer to systems that provide additional functionality but do not directly facilitate the movement of control surfaces in the way auxiliary controls do. Lift control specifically relates to mechanisms aimed at increasing uplift, rather than assisting in the movement of other control surfaces. Thus, while all the other options represent different categories or functions related to flight control, auxiliary controls specifically are designed to aid the operation of primary control surfaces, making them the correct answer.