What quality of an aircraft allows it to be operated easily and withstand imposed stresses?

The quality of an aircraft that allows it to be operated easily and withstand imposed stresses is primarily associated with its maneuverability. Maneuverability refers to how well an aircraft can change its flight path or orientation, responding effectively to pilot inputs. This capability allows for smoother operations during various phases of flight, especially when dealing with turbulence and avoiding obstacles.

While stability contributes to an aircraft's ability to maintain a steady course, and controllability relates to how effectively a pilot can manipulate the aircraft's control surfaces, maneuverability specifically encompasses the ease with which an aircraft can be maneuvered under varying conditions and demands. It ensures that the aircraft can respond appropriately to the stresses placed upon it, such as those encountered during rapid turns or abrupt changes in speed or altitude.

Durability, on the other hand, pertains to an aircraft's structural integrity and its ability to withstand wear and tear over time, which is an important characteristic but does not directly relate to the operational ease in response to commanded actions or imposed flight conditions.