How does the air-fuel ratio affect engine performance and emissions?

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A) A balanced air-fuel ratio optimizes combustion, improving performance and reducing emissions.

B) A richer air-fuel ratio always increases engine power but leads to higher emissions.

C) A lean air-fuel ratio decreases engine efficiency but reduces fuel consumption.

D) The air-fuel ratio has no significant impact on engine performance or emissions.

Quiz: How does the air-fuel ratio affect engine performance and em