Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

Considering Ellingham diagram, Mg metal can be used to reduce alumina. The negative free energy change for the formation of MgO from Mg is greater than that for the formation of Al2O3 from Al. Hence, Mg has a greater tendency to undergo oxidation than Al. Hence, Mg is oxidized and Al2O3 is reduced to Al.