Knowing that "swimming is when humans can move in water", how would one answer "Humans swim in the liquid form of"

OPTIONS:
- steam
- air
- oxygen
- carbon
steam
Hur skulle man kunna svara "Människor simmar i flytande form av" ALTERNATIV: - ånga - luft - syre - kol
How could you answer "People swim in liquid form of" ALTERNATIVE: - steam - air - oxygen - carbon
ånga
steam