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Why is combustion rate faster when the usage of pulverized coal is done in pulverized fuel handling?

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Why is combustion rate faster when the usage of pulverized coal is done in pulverized fuel handling?

(a) Due to greater surface area

(b) For using fuel in powdered form

(c) Decrease in excess air

(d) The speed at which the coal is fed

The question was asked in a national level competition.

My question is taken from Pulverised Fuel Burning in chapter Steam Power Plant of Energy Engineering

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Right option is (a) Due to greater surface area

The best explanation: The combustion rate is faster due to greater surface area of coal per unit mass of coal. It means more coal surface is exposed to heat and oxygen. This decreases excess air required for complete combustion and also decreases fan power. There is an increased rate of evaporation and higher boiler efficiency due to the complete combustion of fuel.

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