12. Which answer below is not a statement of the second law of thermodynamics?
(A) Real processes proceed in a preferred direction.
(B) Energy does not flow spontaneously by heat from a cold to a hot reservoir.
(C) The entropy of the universe increases in all natural processes.
(D) In theory, heat engines working in a cycle employ reversible processes.
(E) You cannot construct a heat engine operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.

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