In the rate-determining step of the $S_{N}1$ hydrolysis of 2-chloro-2-methylpropane, the species formed is:

1. A$(\mathrm{CH}{}_3){}_2\mathrm{CH}-\mathrm{CH}{}_2{}^{+}$ together with $\mathrm{Cl}{}^{-}$
2. B$(\mathrm{CH}{}_3){}_3\mathrm{C}{}^{\bullet }$ together with $\mathrm{Cl}{}^{\bullet }$
3. C$(\mathrm{CH}{}_3){}_3\mathrm{C}{}^{+}$ together with $\mathrm{Cl}{}^{-}$
4. D$(\mathrm{CH}{}_3){}_3\mathrm{C}{}^{-}$ together with $\mathrm{Cl}{}^{+}$