The gas is changing state?(q36)

[jack1234]

For this question:
http://tinyurl.com/2lva7z
The answer is d.

I am not sure what does it mean
"The gas is changing state?"

I refer to the book, a state variable can be pressure, volume, temperature and internal energy...So according to this understanding, can we understand as
changing state = changing either pressure OR volume OR temperature OR internal energy OR any combination of those state variables?

 

[Pythagorean]

I think they mean changing into a liquid