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

 

[ogb p]

I can confirm that "changing state" in this context refers to the change in the physical state of the gas. This can include changes in pressure, volume, temperature, and internal energy, as these are all state variables that can affect the physical state of a gas. It is important to note, however, that a change in one state variable does not necessarily mean a change in the physical state of the gas. For example, a change in pressure alone may not cause a change in the physical state, but a combination of changes in pressure and temperature may result in a change in state. Therefore, we must consider all state variables when determining if a gas is changing state.