Fat has more than twice as many calories per gram as carbohydrates and proteins. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. The expression below represents the total number of calories in a food item.
9x+4(y+z)
What does the term 4(y+z) represent?
A. the number of grams of fat in a food item
B. the number of calories in a food item from fat
C. the number of grams of carbohydrates and proteins in a food item
D. the number of calories in a food item from carbohydrates and proteins