Which of the following statements correctly defines the "Calorific Value" of a fuel?

Options:

• A: The amount of oxygen required to completely burn one mole of the fuel.
• B: The temperature at which a fuel catches fire spontaneously in the presence of air.
• C: The ratio of carbon dioxide produced to the oxygen consumed during combustion.
• D: The amount of heat energy produced by the complete combustion of a unit mass or volume of the fuel.

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