Consider the cell potentials $E^{\large\circ}_{Mg^{2+}|Mg}=-2.37V$ and $E^{\large\circ}_{Fe^{3+}|Fe}=-0.04V$.The best reducing agent would be

Question

$\begin{array}{1 1}Mg^{2+}\\Fe^{3+}\\Mg\\Fe\end{array}$