Which of the following is a characteristic of normal roll law in the flight mode?

In the context of the A320's flight control system, the characteristic associated with normal roll law indicates that stick inputs directly affect roll rates. This means that the rate at which the aircraft rolls is proportional to how far the pilot deflects the sidestick. This system allows for precise and intuitive control over the aircraft's roll behavior, making it easier for pilots to maneuver the aircraft smoothly and accurately during flight.

The direct relationship between stick deflection and roll rate helps pilots to maintain situational awareness and enhances the overall control feel, as there is a clear understanding of how much roll motion will result from their inputs.

Other options highlight different aspects of the aircraft's control systems or do not align with the characteristics of normal roll law. For instance, while turn coordination may involve the rudder and is important for coordinated flight, it is not a primary feature of the normal roll law itself. The relationship of flight control surface deflection to stick input and the role of elevators and ailerons pertain to different control laws and functions within the aircraft's overall flight control framework.