Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?

[A].	Low reactivity of carbonised residue containing high proportions of iron & sulphur.
[B].	Low forced draught and fuel bed temperature.
[C].	Thick fire bed and preheated primary air.
[D].	All (a), (b) and (c).

Answer: Option D

Explanation:

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