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?

Question

( A ) CO2 is thermodynamically more stable than $CS_2$
( B ) $CO_2$ is more volatile than $CS_2$
( C ) Metal sulphides are thermodynamically more stable than $CS_2$
( D ) Metal sulphides are less stable than the corresponding oxides