The correct answer is option C.
The air moving over a cold current cause fog or advection fog when the air is chilled, which decreases the capacity of air to hold water vapor, and eventually, the relative humidity reaches 100% - leading to condensation and fog formation.
What is advection fog?
When warm- moist air or warm air front slides over the cold air front or cold surface, it results in the formation of advection fog.
Resultantly, the air becomes saturated and chilled at high humidity levels due to which water vapors start to condense leading to fog formation.
Moreover, the optimal condition for the formation of advection fog is cloudy windy weather having moderate to powerful winds.
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The complete question is:
Why would air move over a cold current cause fog (advection fog)?
(a) the cold current produces the fog when kelp beds release condensation nuclei.
(b) the cold current produces the fog by mixing with the air.
(c) the air is chilled, which decreases the capacity of air to hold water vapor, and eventually, the relative humidity reaches 100% - leading to condensation and fog formation.
