Which of the Following Isn't an Example of an Oxidation-Reduction $\rightarrow$

Which of the following isn't an example of an oxidation-reduction reaction?

A) H₂(g) + Cl₂(g) $\rightarrow$ 2 HCl(g)
B) Ag⁺(aq) + 2 NH₃(g) Ag(NH₃) ₂⁺(aq)
C) Hg₂Cl₂(s) + NH₃(g) $\rightarrow$ Hg(s) + HgNH₂Cl(s)
D) 2 Mg(s) + O₂(g) $\rightarrow$ 2MgO(s)
E) Cl₂(g) + 2 Br^-(aq) $\rightarrow$ 2 Cl^-(aq) + Br₂(l)