Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

Q. A sulphide ore like $ZnS$ is first roasted to its oxide prior to its reduction by carbon because:

Q. The sulphide ores are generally roasted to oxide for the extraction of metals instead of being directly

Q. A sulphide ore is rarely reduced directly with carbon.
A. If roasted in air, the products are $CO,C{O}_2$ and $S{O}_2$. These being gases escape from the reaction and thus, entropy change is positive and reaction is thermodynamically favourable.
B. If directly reduced with carbon, $C{S}_2$ (liquid) is formed which remain in reaction mixture. Entropy change is less positive and reaction is thermodynamically less favourable.
1. A is correct
2. B is correct
3. A and B are correct
4. A and B are wrong

Q. Prior to reduction, metal sulphide and carbonates are converted into oxides because: