Which sensory sensitivity helps indicate a decrease in speed or settling of the airplane?

The correct choice relates to kinesthesia, which is the body's ability to sense movement and position. This sensory system helps pilots detect changes in speed and orientation of the aircraft through the sensations in their muscles and joints. When an airplane is slowing down or settling into a descent, pilots may not see obvious visual indicators immediately, nor will they necessarily hear anything distinct that reflects the aircraft’s speed. Instead, the perception of body movement, which kinesthesia provides, allows pilots to feel changes in acceleration or deceleration. This internal sense is critical for maintaining awareness of the aircraft’s performance and responding appropriately to changes in flight conditions.