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How do the chances of spontaneous combustion of coal can decrease?

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How do the chances of spontaneous combustion of coal can decrease?

(a) Decrease in the maturity of coal

(b) By washing the coal time to time

(c) Increase in the maturity of coal

(d) By the reducing the quantity of coal

I have been asked this question in examination.

The origin of the question is Coal Technology in division Fuels and Combustion of Engineering Chemistry II

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Right option is (c) Increase in the maturity of coal

For explanation: The coal of high maturity (anthracite) contains less impurities due to which it does not gets oxidise easily, also the volatile matter present in them is less. Washing of coal can cause an increase in moisture content due to which the coal produced will not be of good quality.

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