Choose the correct option of temperature at which carbon reduces \(...

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Choose the correct option of temperature at which carbon reduces \( \mathrm{FeO} \) to iron and produces \( \mathrm{CO} \).
(i) Below temperature at point \( \mathrm{A} \).
(ii) Approximately at the temperature corresponding to point \( \mathrm{A} \).
(iii) Above temperature at point \( A \) but below temperature at point \( D \).
(iv) Above temperature at point \( \mathrm{A} \).
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