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What is the advantage of breaking coal into smaller pieces in pulverized fuel handling?

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What is the advantage of breaking coal into smaller pieces in pulverized fuel handling?

(a) Easy coal feeding

(b) No clogging coal since they are in powder form

(c) Exposes more surface of the coal

(d) Increase in combustion rate

I have been asked this question during an interview.

Question is from Pulverised Fuel Burning in section Steam Power Plant of Energy Engineering

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Right choice is (c) Exposes more surface of the coal

To elaborate: By breaking, a given mass of coal into smaller pieces exposes more surface area for combustion. The increase of surface area exposed per unit volume with the decreasing diameter of coal particle. As shown in graph below, this increase varies rapidly after 0.01 inch diameter of the coal particle and there is no substantial increase after 0.001 inch diameter.

           SURFACE AREA VS COAL PARTICLE DIAMETER

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