[الشيمآء]

wa 3alykom as-salam

hi danno ^^"

look f I'm not mistaken,
it's all about how many gases moles r consumed comparing to which r produced ..

so, I believe .. it's
1: work is done by the system on the surrounding
2: work is done by the surrounding on the system
3: work is done by the system on the surrounding
4: No work is done

- I'm just guessing -