The primary purpose of stall strips is to?

The primary purpose of stall strips is to stall the inboard portion of the wings first. Stall strips are small, fixed aerodynamic devices that are typically attached to the leading edge of the wing near the root. When the aircraft approaches a stall condition, these strips cause airflow to separate at the inboard section of the wing before it does so at the outboard section. This design enhances the aircraft's controllability during slow flight and stall scenarios by ensuring that the pilot maintains some aileron control, as the outboard section of the wings will still be providing lift. Such an approach helps to prevent unexpected roll tendencies that could occur if the outboard sections stalled first, allowing for safer maneuvers and recovery from stalls.

The other options do not accurately describe the primary function of stall strips. Improving aerodynamics is a more general principle and not the specific purpose of stall strips. Stalling the outboard portion of the wings would have the opposite effect, potentially leading to loss of control. Enhancing control surfaces performance does not directly relate to the key function of stall strips, which is specifically about managing stalls in a predictable manner.