.The function of an automobile catalytic converter is to control emissions of

A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds like carbon dioxide and water. We all know that there is a large amount of release of pollutants in the form of unburned gasoline or from the combustion of gasoline by the automobile’s engine.
A three-way catalytic converter does the following three functions simultaneously:
1. Reduction of nitrogen oxides into elemental nitrogen and oxygen:
$N{O}_x\to N_x+O_x$
2. Oxidation of carbon monoxide to carbon dioxide:
$CO+O_2\to C{O}_2$
3. Oxidation of hydrocarbons into carbon dioxide and water:
$C_x{H}_{4x}+2x{O}_2\to xC{O}_2+2x{H}_{2}O$
Option B contains carbon monoxide and hydrocarbons which are among the harmful pollutants and catalytic converters control their emissions by converting them into harmless carbon dioxide and water. Thus, option B is the correct answer.