Catalytic converters reduce which of the following pairs of pollutants in car exhaust?

Carbon monoxide and hydrocarbons is the answer

Carbon monoxide and hydrocarbons

Explanation:

Catalytic converters are used in exhaust systems to provide a site for the oxidation and reduction of toxic by-products (like nitrogen oxides, carbon monoxide, and hydrocarbons) of fuel into less hazardous substances such as carbon dioxide, water vapor, and nitrogen gas