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Which relationship connects carbon dioxide to fuel consumption?

  • A.There is no relationship, since carbon dioxide depends upon the combustion process rather than the quantity burnt
  • B.They are inverse
  • C.Every litre of fuel burnt produces a fixed mass of carbon dioxide, so reducing one necessarily reduces the other
  • D.They are directly proportional for a given fuel

Answer: D

Carbon dioxide output follows directly from the carbon in the fuel burnt. The last option states that relationship explicitly, which makes it a correct and more concrete version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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