What is the most likely cause of destruction for a catalytic converter in new cars?

Answer: B — Use of leaded gasoline

The destruction of a catalytic converter in new cars is most likely due to the use of leaded gasoline. Catalytic converters are designed to reduce harmful emissions by converting them into less harmful substances. However, leaded gasoline contains tetraethyl lead, which can coat the catalyst materials inside the converter, rendering them ineffective. The presence of lead prevents the necessary chemical reactions from occurring, ultimately leading to converter failure. On the other hand, unleaded gasoline is what vehicles, particularly those with catalytic converters, are designed to use, as it does not produce harmful deposits that could damage the converter. Improper installation, while potentially causing issues, is less common compared to fuel-related problems and typically would not lead to destruction in the way improper fuel does. Regular maintenance is beneficial for a vehicle’s overall functioning and can prolong the life of components, including the catalytic converter, rather than causing any destruction.