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Which outcome occurs when a catalytic converter deactivates?

A)Increased harmful exhaust emissions result
B)Improved engine fuel efficiency happens
C)Decreased engine operating temperature occurs
D)Enhanced regulation of air-fuel ratio happens

💡 Explanation

Increased harmful exhaust emissions result because catalyst deactivation reduces oxidation-reduction efficiency. This is due to catalyst poisoning, rather than improved fuel efficiency or regulation, because those require a fully functional converter.

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