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How the oxidation of coal is eliminated?

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How the oxidation of coal is eliminated?

(a) By exposing it to the sunlight

(b) By turning the entire coal heap upside down periodically

(c) By circulating air uniformly

(d) By burning coal at very high temperatures

The question was asked during a job interview.

My question is from Fuel Handling System, Storage of Coal in portion Steam Power Plant of Energy Engineering

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Correct answer is (c) By circulating air uniformly

To explain: The heat of oxidation is removed by circulating air uniformly through layers. Air thus circulated carries away the excess heat, maintaining coal below its combustion temperature of 343K. Oxidation can also be avoided by sealing the coal heap asphalt, fine coal dust or bituminous powder.

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