How does improper rigging of the right wing of a monoplane affect the aircraft?

Improper rigging of the right wing of a monoplane can significantly compromise the aircraft's performance and handling characteristics. When the wing is not rigged correctly, it can create an imbalance that affects both lateral stability and directional control. This imbalance may cause the aircraft to roll more to one side, requiring constant input from the pilot to maintain level flight.

Additionally, this can lead to adverse yaw, where the aircraft tends to turn towards the lower wing due to the differential lift and drag generated between the wings. An aircraft that is off balance in this manner will have difficulty maintaining straight and level flight, resulting in pilot workload increase and potentially hazardous flight conditions.

In contrast, the other options suggest improvements to performance, efficiency, or aerodynamic qualities, which are not possible when rigging is incorrect. Proper wing rigging is crucial for ensuring the aircraft reacts predictably and safely during all phases of flight.