The correct statement for the reduction of FeO at the temperature corresponding to point D is:

 1 ∆G value for the overall reduction reaction with carbon monoxide is zero. 2 ∆G value for the overall reduction reaction with a mixture of 1 mol carbon, and 1 mol oxygen is positive. 3 ∆G value for the overall reduction reaction with a mixture of 2 mol of carbon, and 1 mol of oxygen will be positive. 4 ∆G value for the overall reduction reaction with carbon monoxide is negative.

HINT: See the Ellingham diagram.
Explanation:
At point D, the $∆\mathrm{G}$ curve for the formation of ${\mathrm{CO}}_{2}$ from $\mathrm{CO}$ and FeO from Fe intersect with each other, therefore, the ΔG value for the overall reduction reaction with carbon monoxide is zero.
Hence, (1) is the correct choice.