22. Which of the following statements is correct?
(A)the internal energy of a system increases when more work is done by the system than heat is flowing into the system
(B)the internal energy of a system decreases when work is done on the system and heat is flowing into the system
(C)the system does work on the surroundings when an ideal gas expands against a constant external pressure
(D)all the statements are true
(E)all the statements are false