What function does a catalytic converter serve in a vehicle?

A catalytic converter primarily serves the function of reducing pollution from exhaust gases. It is an essential component of a vehicle’s emission control system, designed to convert harmful pollutants such as carbon monoxide, nitrogen oxides, and hydrocarbons into less harmful substances, like carbon dioxide and nitrogen.

By facilitating chemical reactions within its catalytic structure, the converter significantly lowers the levels of these toxic gases that are released into the atmosphere, thus playing a crucial role in meeting environmental regulations and improving air quality. Unlike other options, which may refer to secondary benefits of a properly functioning engine or modifications, the core and primary purpose of a catalytic converter lies in its ability to clean up exhaust emissions, making choice B the most accurate response.