What is the effect of the centre of gravity being close to the forward limit?

When the centre of gravity (CG) is positioned close to the forward limit, it primarily results in a decrease in the rate of climb capability. This is because a forward CG location generally increases the aircraft's control forces, requiring more input from the pilot to maintain level flight or to climb.

In a forward CG scenario, the aircraft tends to have a higher angle of attack to maintain lift, which can adversely affect performance. The additional control force may lead to higher drag, which impacts the overall climb performance. Additionally, with a forward CG, the aircraft might be less responsive to control inputs, requiring a greater workload for the pilot, particularly during climbing maneuvers.

As such, the increased drag and reduced maneuverability due to the more forward positioning of the CG can lead to a compromised rate of climb, making the option that indicates a decrease in climb capability the correct response. The other options do not align with the aerodynamic implications of a forward CG position, as they suggest changes in drag or fuel efficiency that are not typically associated with the forward CG scenario.