Which of the following have maximum calorific value?

Food contains a number of basic elements such as carbohydrates, proteins, fats and alcohol. These elements all produce different quantities of energy when burnt. The amount of energy produced when one gram of any of these elements is burned is known as its\ncalorific value\n.\nFood component\nEnergy density\nkJ/g\nkcal/g\nFat\n37\n9\nEthanol\xa0(drinking alcohol)\n29\n7\nProteins\n17\n4\nCarbohydrates\n17\n4\nOrganic acids\n13\n3\nPolyols\xa0(sugar alcohols,\xa0sweeteners)\n10\n2.4\nFiber\n8\n2