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

Multiple Choice

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

A) Ca₃P₂(s) + 6 H₂O(l) $\rightarrow$ 3 Ca²⁺(aq) + 6 OH^-(aq) + 2 PH₃(g)
B) 2 PH₃(g) + 4 O₂(g) $\rightarrow$ H₃PO₄(s)
C) P₄(s) + 5 O₂(g) $\rightarrow$ P₄O₁₀(s)
D) 6 Ca(s) + P₄(s) $\rightarrow$ 2 Ca₃P₂(s)
E) All of the above are oxidation-reduction reactions.