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.