Which of the following conditions can lead to the development of carburetor ice?

The development of carburetor ice occurs primarily due to specific atmospheric conditions related to temperature and humidity. The correct answer identifies high humidity and moderate temperatures as the condition that can lead to the formation of carburetor ice.

When air passes through the carburetor, it experiences a drop in pressure, resulting in a decrease in temperature. If the surrounding air is humid enough, the moisture present can condense and freeze as the temperature drops in the carburetor, leading to the formation of ice. This process is more common in conditions where the air is humid, as the amount of water vapor increases the potential for ice formation in the colder temperatures created within the carburetor's throat.

In contrast, high temperatures and low humidity or low humidity and high temperatures create conditions that do not favor ice formation. High temperatures reduce the likelihood of the air cooling sufficiently enough to freeze any moisture, while low humidity diminishes the amount of water vapor available to condense and freeze, leading to minimal risk for carburetor icing. Therefore, the combination of high humidity and moderate temperatures provides the ideal conditions for carburetor ice to develop.