54. Which of the following statements about an ideal gas confined in a box is true?
(A)For an adiabatic free expansion process, the temperature remains constant.
(B)For an isobaric process, the temperature can only increase.
(C)For an adiabatic process, the temperature remains constant, regardless of thegas expansion or not.
(D)For an isochoric (fixed volume but not adiabatic) process, the temperatureremains constant.
(E)For an isochoric (fixed volume) process, the internal energy can decrease as thetemperature increases.