In which of the following reactions does the hybridisation of the central atom change from $sp^2$ to $sp^3$?
- A$NH_3 + H^{+} \to NH_4^{+}$
- B$AlF_3 + 3F^{-} \to AlF_6^{3-}$
- C$BF_3 + F^{-} \to BF_4^{-}$
- D$H_2O + H^{+} \to H_3O^{+}$
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