2. Consider the second law of thermodynamics. Which ones of the following statements are correct?
(A) It is possible for a heat engine that operates in a cycle to convert its heat input completely into work.
(B) In a reversible process the entropy of an isolated system increases; in an irreversible process the entropy stays constant.
(C) In a reversible process the entropy of an isolated system stays constant; in an irreversible process the entropy decreases.
(D) No cyclical heat engine has a greater efficiency than a reversible engine operating between the same two pressures.
(E) It is possible for a heat engine that operates in a cycle to transfer heat continuously from a hot body to a cold body without the input of work.