8. In which process will the internal energy of the system NOT change?
(A) An adiabatic expansion of an ideal gas.
(B) The evaporation of a quantity of a liquid at its boiling point.
(C) An isothermal compression of an ideal gas.
(D) An isobaric expansion of an ideal gas.
(E) The freezing of a quantity of liquid at its melting point.
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