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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