The correct option is B At 1400oC,Al can be used for the extraction of Zn from ZnO
From the Ellingham diagram, we can say that any oxide with lower value of ΔG∘ is more stable than a oxide with higher value of ΔG∘. We can also predict that the oxide placed higher in the diagram can be reduced by the element involved in the formation of its oxide placed lower at that temperature in the diagram.
It is happening in case of ZnO for its reduction by Al at 1400oC.