In the laboratory, the labels had come off four bottles. A student noticed that the substance in one of them could be recognised quite easily, since when water was added it would not release fumes of hydrogen chloride. Which one did not produce the $\text{HCl}$ fumes?
- A$\text{Al}_2\text{Cl}_6$
- B$\text{MgCl}_2$
- C$\text{PCl}_5$
- D$\text{SiCl}_4$