(C) The coordination number is defined as the number of ligand donor atoms to which the metal is directly bonded. In the complex $[CoCl_2(NH_3)_4]^+$,

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(C) The coordination number is defined as the number of ligand donor atoms to which the metal is directly bonded. In the complex $[CoCl_2(NH_3)_4]^+$,the central metal ion is $Co^{3+}$. There are $2$ $Cl^-$ ligands (monodentate) and $4$ $NH_3$ ligands (monodentate). Total coordination number = $(2 \times 1) + (4 \times 1) = 6$.