The octane number of a sample of petrol is $40$. It means that its knocking property is equal to the mixture of
- A$40\%$ $n$-heptane + $60\%$ iso-octane
- B$40\%$ petrol + $60\%$ iso-octane
- C$60\%$ $n$-heptane + $40\%$ iso-octane
- D$60\%$ petrol + $40\%$ iso-octane
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