$\text{AlCl}_3$ vapour forms molecules of formula $\text{Al}_2\text{Cl}_6$ as it is cooled. How do the bond angles change during the transformation from $\text{AlCl}_3$ to $\text{Al}_2\text{Cl}_6$?
- ASome decrease, some remain the same.
- BSome increase, some remain the same.
- CThey all decrease.
- DThey all increase.