Which of the following reactions is NOT a redox reaction?

A redox reaction involves a change in the oxidation states of atoms.In (A), $\text{Cl}$ changes from $+5$ to $0$ and $\text{I}$ changes from $0$ to $+5$. (Redox)In (B), $\text{H}$ changes from $0$ to $+1$ and $\text{Cl}$ changes from $0$ to $-1$. (Redox)In (C), $\text{Ba}$ is $+2$, $\text{Cl}$ is $-1$, $\text{Na}$ is $+1$, and $\text{S}$ is $+6$ in both reactants and products. No oxidation state changes. This is a double displacement/precipitation reaction.In (D), $\text{Zn}$ changes from $0$ to $+2$ and $\text{Cu}$ changes from $+2$ to $0$. (Redox)