Under conditions of $2500~\text{K}$ and $1.00\times10^{-4}~\text{Pa}$, a $0.321$ g sample of sulfur vapour occupies $2.08\times10^6~\text{m}^3$. What molecular formula does sulfur have in these conditions?
- A$ ext{S}$
- B$ ext{S}_2$
- C$ ext{S}_4$
- D$ ext{S}_8$