Macronutrient Food calories Kilojoules Protein 4.0 16.7 Fat 9.0 37.7 Carbohydrate 4.0 16.7 The above table gives the typical amounts of energy per gram, expressed in both calories and kilojoules of the three macronutrients in food. If the 180 food calories in granola bar come entirely from p grams of protein, f grams of fat and c grams of carbohydrates, which of the following expresses f in terms of p and c? Of = 20 -= (p+c) O f= 20 - 2 (p-c) Of = 20+ ; (p+c) Of = 20+= (P -C)