In Humans, Glycogen Is a More Useful Food-Storage Molecule Than

In humans, glycogen is a more useful food-storage molecule than fat because

A) a gram of glycogen produces more energy than a gram of fat.
B) it can be utilized to produce ATP under anaerobic conditions, whereas fat cannot.
C) it binds water and is therefore useful in keeping the body hydrated.
D) for the same amount of energy storage, glycogen occupies less space in a cell than does fat.