Which of the following measures can increase icing risk on an aircraft?

The choice involving sharp aircraft components stands out in the context of icing risk. Sharp edges and components on an aircraft can contribute to the formation of ice due to the way they interact with supercooled water droplets present in clouds or precipitation. When these droplets impact sharp surfaces, they can cause the droplets to freeze more readily, thus increasing the chances of ice accumulation.

In contrast, clear weather conditions typically signify a lack of clouds containing supercooled water, which reduces the risk of icing. Low humidity levels also contribute to a lower icing risk, as they can mean fewer water droplets are present in the atmosphere to freeze. High cruising altitudes, while they may expose an aircraft to colder temperatures, do not inherently increase icing risk unless there are also clouds of supercooled water at those altitudes. Therefore, the physical characteristics of aircraft components, such as sharpness, play a crucial role in the dynamics of ice formation during flight.