ASVAB Practice Test

The catalytic converter is an important part of the emission control system in a vehicle. It helps to reduce harmful pollutants in the exhaust gases by converting them into less harmful substances. Option A, cooling, is incorrect because a catalytic converter does not play a role in cooling the vehicle's engine. Option B, electrical, is also incorrect because a catalytic converter does not rely on electricity to function. Option D, fuel injection, is also incorrect because fuel injection is a separate system responsible for delivering fuel to the engine. Therefore, the correct answer is C, emission control.