Concept:Energy-yielding nutrients provide different amounts of energy per gram, and fats are the most concentrated source.Explanation:Fat produces about 9 kcal of energy per gram.In comparison, proteins and carbohydrates like glucose produce only about 4 kcal per gram.Amino acids are the building blocks of proteins, not a direct, major energy supply.Therefore, among the given options, fat releases the highest amount of energy for the same mass.Answer:Fat (Option C).