Question 693Navigation General

The correct answer is D) All of the above. Fog is formed when the moisture in the air is condensed into small droplets, which occurs when air is cooled to its dew point. This causes the base of a cloud to form on the ground, resulting in the formation of fog. All three of the conditions described in the answer choices contribute to the formation of fog. The other options are incorrect because they only describe partial conditions required for fog formation, while the correct answer encompasses all the key factors involved.