Q: Fact 1: If food is not immediately used by the body for energy then that food will be stored for future use. Fact 2: Basically, heat is energy. Given the two facts above, when food is not immediately used for what it is stored in the body?

Available choices:
a). fats;
b). pH;
c). warmth;
d). matter;
e). sodium;
f). heat;
g). sugar;
h). Mass;
A:
f).