Final answer:
Option C (The total entropy of an isolated system cannot decrease) is not a statement of the First Law of Thermodynamics but rather the Second Law. The First Law is about energy conservation.
Step-by-step explanation:
The option that is NOT a statement of the First Law of Thermodynamics is C) The total entropy of an isolated system cannot decrease. This option refers to the Second Law of Thermodynamics, which discusses the direction of energy transfers and the increase in entropy, rather than the conservation of energy. The First Law of Thermodynamics, also known as the law of conservation of energy, states that energy in the universe remains constant, meaning it can neither be created nor destroyed, but can be converted from one form to another.