In which of the following reactions does the hybridization 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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