The complex that dissolves in water is

  • A
    $Fe_4[Fe(CN)_6]_3$
  • B
    $[Fe_3(OH)_2(OAc)_6]Cl$
  • C
    $K_3[Co(NO_2)_6]$
  • D
    $(NH_4)_3[As(Mo_3O_{10})_4]$

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