Concept:Foods rich in fats provide more energy per gram than carbohydrates or proteins.
Explanation:During oxidation, different food nutrients release different amounts of energy.
Fats supply about
9 kcal/g, while carbohydrates and proteins supply about
4 kcal/g.
Butter contains about
80% fat, making it extremely energy-dense.
Sugar is mainly carbohydrate, so its energy yield per 100 kg is lower.
Biscuits contain some fat but are still largely carbohydrate.
Meat contains a high proportion of water and protein, not fat.
Therefore, for the same mass of
100 kg, butter provides the greatest energy on complete oxidation.
Answer:B. Butter