When ammonia is added to a cupric salt solution, the deep blue colour is observed it is due to the formation of 

  • A

    ${\left[ {Cu{{\left( {OH} \right)}_4}} \right]^{2 - }}$

  • B

    ${\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}$

  • C

    ${\left[ {Cu{{\left( {{H_2}O} \right)}_2}{{\left( {N{H_3}} \right)}_2}} \right]^{2 + }}$

  • D

    ${\left[ {Cu{{\left( {{H_2}O} \right)}_4}} \right]^{2 + }}$

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  • [NEET 2014]