Visible light will be absorbed by

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(C) Transition metal complexes absorb visible light only when they have an incomplete $d$-subshell,allowing for $d-d$ transitions.In $[Sc(H_2O)_3(NH_3

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$[Cr(NH_3)_6]^{3+}$

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(C) Transition metal complexes absorb visible light only when they have an incomplete $d$-subshell,allowing for $d-d$ transitions.In $[Sc(H_2O)_3(NH_3)_3]^{3+}$,$Sc^{3+}$ has a $d^0$ configuration.In $[Ti(en)_2(NH_3)_2]^{4+}$,$Ti^{4+}$ has a $d^0$ configuration.In $[Zn(NH_3)_6]^{2+}$,$Zn^{2+}$ has a $d^{10}$ configuration.In $[Cr(NH_3)_6]^{3+}$,$Cr$ is present as $Cr^{3+}$.The electronic configuration of $Cr^{3+}$ is $[Ar] 3d^3$.Since the complex has unpaired electrons in the $d$-subshell,$d-d$ transitions are possible,and it will absorb visible light.

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