Which of the following describes the thermodynamic standard state of carbon?

Which of the following is most thermodynamically stable allotrope of carbon?

Which of the following is thermodynamically most stable form of carbon? Coke, diamond, graphite, fullerenes.

Which of the following state function is not zero at standard state :-

Which of the following state function is not zero at standard state :-

Which of the following parameters does not characterize the thermodynamic state of matter?