Final answer:84 grams of fat yield (option 2.) 756 kilocalories of energy when metabolized, as fat provides 9 kcal per gram.Explanation:The question is asking about the energy yield from a certain amount of fat when metabolized by the body. According to nutritional science, 1 gram of fat yields 9 kilocalories (kcal) of energy. Therefore, to calculate the number of kilocalories from 84 grams of fat, we can use simple multiplication:Energy yield per gram of fat: 9 kcal/gTotal grams of fat: 84 gTotal energy yield: 84 g × 9 kcal/g = 756 kcalThe correct answer to the question is 756 kilocalories....

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