Question 1229Navigation General

You are correct, the answer is B) air temperature. Fog is likely to occur when there is little difference between the dew point and the air temperature. This is because when the air temperature is close to the dew point, the air becomes saturated with water vapor, resulting in the formation of fog. The other options are incorrect because they do not directly impact the formation of fog. Absolute humidity and relative humidity are related to the amount of water vapor in the air, but do not specifically determine when fog will form. Barometric pressure can influence fog formation, but is not the primary factor.