What happens when the aircraft's CG moves forward?

When the aircraft's center of gravity (CG) moves forward, it leads to improved stability. A forward CG position increases static stability, which is the tendency of the aircraft to return to its original position after being disturbed. This enhanced stability occurs because the weight acts closer to the front of the aircraft, providing a greater restoring moment when the aircraft pitches up or down. As a result, the aircraft tends to be less responsive to control inputs, which can be advantageous during flight, especially for stability during various phases such as takeoff and landing.

Although other options mention aspects of flight dynamics, they do not accurately reflect the effects of a forward CG. For instance, being tail-heavy is associated with a rearward CG, while a loss in aerodynamic efficiency or an increased likelihood of stalling relates to balance and control issues typically linked to an extreme CG position rather than simply moving the CG forward.