What are the two ends of a flight control system?

The reason the first option is accurate is that the two ends of a flight control system fundamentally involve the pilot's controls as the point of initiation and the external aircraft changes as the response of those controls. The pilot manipulates control surfaces like ailerons, elevators, and rudders through their inputs, resulting in the aircraft altering its position, orientation, and direction in response to those commands. This relationship forms a complete system where the pilot's input directly affects the aircraft's behavior, demonstrating how flight control systems operate.

The other choices do not encapsulate the concept of a flight control system as clearly. The cockpit and passenger cabin reference the separation of operational areas but do not define the control mechanisms at play. The cockpit and fuel systems are unrelated since fuel systems pertain more to aircraft operation rather than direct control. Lastly, while the wing and tail structure are integral parts of the aircraft for stability and control, they do not represent the interactive nature of the control system between pilot inputs and aircraft responses. Therefore, the focus on pilot controls and aircraft changes perfectly aligns with the definition of a flight control system.