Oxides of nitrogen in the engines exhaust can be reduced by the follow – McqOptions

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1.	Oxides of nitrogen in the engines exhaust can be reduced by the following methods:1. Decrease in compression ratio2. Exhaust gas recirculation3. Use of 5% lean mixture4. Use of oxidation catalysts in exhaust manifold.The correct methods are
A.	1 and 2
B.	1 and 3
C.	1, 2 and 4
D.	2, 3 and 4
Answer» D. 2, 3 and 4

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