The Energy Equivalent of Oxygen Is the
A) Number of Calories

The energy equivalent of oxygen is the

A) number of calories contained in every liter of oxygen consumed
B) value that equates how much energy is liberated from food for every liter of oxygen consumed
C) oxygen consumption required for the processing and storage of ingested foodstuff
D) energy required to raise 1 g of H₂O 1 $\degree$ C
E) none of these