According to Ellingham diagram the oxidation reaction of carbon and carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature?

According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature ?

According to Ellingham diagram , the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at lowest temperature ?

According to Ellingham diagram, the oxidation reaction of carbon to carbondioxide may be used to reduce which one of the following oxides at the lowest temperature ?