Fixing pieces of magnesium onto iron pipes buried underground can prevent the iron from corroding. Which reaction is responsible for protecting the iron from corrosion?
- A$\text{Fe}^{2+}(aq) + 2e^- \rightarrow \text{Fe}(s)$
- B$\text{Fe}(s) \rightarrow \text{Fe}^{2+}(aq) + 2e^-$
- C$\text{Mg}^{2+}(aq) + 2e^- \rightarrow \text{Mg}(s)$
- D$\text{Mg}(s) \rightarrow \text{Mg}^{2+}(aq) + 2e^-$