If the nose wheel moves aft during gear retraction, how is the centre of gravity affected?

When the nose wheel moves aft during gear retraction, it shifts the weight distribution of the aircraft. The center of gravity (CG) is the point where the total weight of the aircraft is concentrated and influences how the aircraft will behave in flight.

In this scenario, retracting the nose wheel moves a significant portion of the aircraft's weight toward the back. Consequently, this causes the CG to shift aft. An aft movement of the CG can have various effects on the aircraft's stability and control characteristics, particularly affecting the longitudinal stability and handling.

The remaining options imply that the change in CG either does not occur, moves in the opposite direction, or is ambiguous. However, the specific mechanics of gear retraction during which the nose wheel moves aft make it clear that the CG will indeed be affected, leading to a rearward shift.