When warm moist air blows over a colder surface and is cooled below its dew point, the result is __________.

Correct Answer: Option D — advection fog

Advection fog forms when warm, moist air moves horizontally over a significantly colder surface, causing the lower layers to cool below their dew point. Per Bowditch, this widespread maritime phenomenon relies on wind-driven air mass movement rather than nocturnal radiational cooling.