Redox — practice question

Which equation shows a reduction reaction?

• A$\text{Fe}^{2+} + e^- \rightarrow \text{Fe}^{3+}$
• B$\text{Fe}^{2+} \rightarrow \text{Fe}^{3+} + e^-$
• C$\text{Fe}^{3+} + e^- \rightarrow \text{Fe}^{2+}$
• D$\text{Fe}^{3+} \rightarrow \text{Fe}^{2+} + e^-$