Which of the Following Statements Is True

Which of the following statements is true?

A) An irreversible process cannot be shown on a p-V diagram because the intermediate states are unknown.
B) The first law of thermodynamics shows that heat added to a system always results in work being done.
C) An adiabatic process is one which involves no work.
D) In an isobaric expansion,the temperature does not change.
E) The second law of thermodynamics does not apply to a closed system.