In which of the following species is the interatomic bond angle $109^o 28'$?

  • A
    $NH_3, (BF_4)^-$
  • B
    $(NH_4)^+, (BF_4)^-$
  • C
    $NH_3, BF_4$
  • D
    $(NH_2)^-, BF_3$

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