If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the
(A) Process must be isobaric
(B) Temperature must decrease
(C) Process must be adiabatic
(D) Both (B) and (C)
(A) Process must be isobaric
(B) Temperature must decrease
(C) Process must be adiabatic
(D) Both (B) and (C)