In which of the following reaction, the hybridisation of the central atom changes from $sp^2$ to $sp^3$ ?

  • A

    $N{H_3} + {H^ + } \to NH_4^ + $

  • B

    $Al{F_3} + 3{F^ - } \to AlF_6^{3 - }$

  • C

    $B{F_3} + {F^ - } \to BF_4^ - $

  • D

    ${H_2}O + {H^ + } \to {H_3}{O^ + }$

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