What is one consequence of failing to properly de-ice an aircraft?

The correct answer highlights a significant safety concern associated with inadequate de-icing practices. When ice accumulates on an aircraft, it alters the aerodynamic properties of the wings and control surfaces. This can lead to a reduction in lift, increased drag, and changes in the aircraft's center of gravity. Consequently, these factors create unsafe flight conditions that can impede the pilots' ability to control the aircraft effectively during takeoff, climb, and maneuvers.

Choosing this option emphasizes the critical nature of de-icing as a preventive measure against the potential hazards posed by ice formation, which can lead to serious incidents during flight. It underscores the necessity of ensuring that an aircraft is free from ice and snow to maintain safe operations, especially in winter conditions or in climates prone to ice accumulation.