Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

[A].	the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
[B].	it reduces its calorific value tremendously.
[C].	it reduces its flame temperature tremendously.
[D].	there are chances of explosion during preheating.

Answer: Option A

Explanation:

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