The substance that stores the most energy is one gram of fat (Option C).
A gram of fat contains approximately 9 calories.
Moreover, a gram of carbohydrate provides 4 calories, whereas a gram of protein also contains approximately 4 calories.
Finally, a gram of alcohol contains approximately 7 calories (almost as many as one gram of fats).
In conclusion, the substance that stores the most energy is one gram of fat (Option C).
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