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Which risk increases when internal combustion engine efficiency drops due to incomplete combustion?

A)Unburned hydrocarbon emission rate increases
B)Reduced engine knocking failure probability
C)Catalytic converter efficiency maintains output
D)Lower NOx production from leaner fuel

💡 Explanation

Incomplete combustion slows oxidation, so the increased fuel concentration leads to higher emission rates output, because the carbon atoms react inefficiently; therefore unburned hydrocarbons increase emissions, rather than being fully converted into less harmful byproducts.

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