How can you determine how much energy a food item contains?
a. taste the food.
b. weigh the food.
c. look at the amount of calories.
d. look at what color the food is.

The answer would be C because a calorie is a unit of heat equal to the amount of heat needed to raise the temperature of 1,000 grams of water by one degree Celsius. This unit is used as a measure of the energy released by food as it is digested by the human body. All the other options don't apply correctly to the question because they don't determine anything.