A practical fuel must meet specific criteria such as energy content, abundance, and ease of oxygen reaction. Solid state requirement is not a universal need for practical fuels.
Fuel requirements include containing a large amount of stored energy, being abundant or easy to produce, and combining easily with oxygen. The option that does not align with a practical fuel requirement is OD. It must be in the solid state to be used. Solid state fuels are not always a necessity for practical fuel usage.
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