Which of the Following Reactions Would Require the Use of an Inert

Multiple Choice

Which of the following reactions would require the use of an inert electrode when used in a voltaic cell?

A) Cu(s) + 2Ag⁺(aq) $\to$ 2Ag(s) + Cu²⁺(aq)
B) 3Cu(s) + 2Au³⁺(aq) $\to$ 3Cu²⁺ + 2Au(s)
C) Cu(s) + 2Ag⁺(aq) $\to$ Cu²⁺(aq) + 2Ag(s)
D) Co(s) + 2MnO₂(s) + 2NH₄⁺(aq) $\to$ Co²⁺(aq) + Mn₂O₃(s) + 2NH₃(aq) + H₂O( $\ell$ )
E) 3Zn²⁺(aq) + 2Al(s) $\to$ 3Zn(s) + 2Al³⁺(aq)