(B) According to the Ellingham diagram,at temperatures below $983 \, K$,the $\Delta G$ value for the oxidation of $CO$ to $CO_2$ is more negative than

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(B) According to the Ellingham diagram,at temperatures below $983 \, K$,the $\Delta G$ value for the oxidation of $CO$ to $CO_2$ is more negative than the $\Delta G$ value for the oxidation of $C$ to $CO$. Since $CO$ has a greater affinity for oxygen at this temperature,it acts as a better reducing agent than $C$ at $673 \, K$.