(C) Let the oxidation state of cobalt $(Co)$ be $x$.The oxidation state of the neutral ligand ammonia $(NH_3)$ is $0$.The overall charge on the comple

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(C) Let the oxidation state of cobalt $(Co)$ be $x$.The oxidation state of the neutral ligand ammonia $(NH_3)$ is $0$.The overall charge on the complex ion $[Co(NH_3)_6]^{3+}$ is $+3$.Setting up the equation: $x + 6(0) = +3$.Solving for $x$: $x = +3$.Therefore, the oxidation state of cobalt is $+3$.