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# The Ellingham diagram are constructed for the formation of oxides of elements and they can predict.

$(a)\;\text{the feasibility of themal reduction of an ore} \\(b)\;\text{the feasibility of metallic reduction of an ore.} \\(c)\; \text{The feasibility of metallic oxidation of an ore} \\ (d)\;\text{none}$

They are related to thermal aspects only.
Hence a is the correct answer.