In Certain Automotive Catalytic Converters,one Step Involves the Catalyzed Reduction

Multiple Choice

In certain automotive catalytic converters,one step involves the catalyzed reduction by carbon monoxide of nitric oxide (nitrogen monoxide) to nitrogen gas,with the carbon monoxide being converted to carbon dioxide.When the equation for this process is balanced,the sum of the coefficients is ________.

A) 4
B) 5
C) 7
D) 9
E) 11