Select an acceptable statement considering the Kelvin-Planck statement:
A) No process can produce more work than the heat input
B) No engine can produce more work than the heat rejected
C) A process cannot produce work without a heat input
D) An engine must reject heat
D) An engine must reject heat
The Kelvin-Planck statement refers to an engine, not a process, so (D) is the best answer.
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