Which of the Following Reactions Is Not an Oxidation-Reduction Reaction $\rightarrow$

Multiple Choice

Which of the following reactions is not an oxidation-reduction reaction?

A) C(s) + CO₂(g) $\rightarrow$ CO₂(g)
B) CO(g) + Cl₂(g) $\rightarrow$ COCl₂(g)
C) 2H₂O₂(l) $\rightarrow$ 2H₂O(l) + O₂(g)
D) CaCO₃(s) + 2HCl(aq) $\rightarrow$ CaCl₂(aq) + CO₂(g) + H₂O(l)
E) 2HI(g) $\rightarrow$ H₂(g) + I₂(g)