Which are correctly is matched

Consider the following steps ${\mathrm{Cu}}_2\mathrm{S}\stackrel{\mathrm{roast} \mathrm{air}}{\to }\mathrm{A}\stackrel{\mathrm{Heating} \mathrm{without} \mathrm{air}}{\to }\mathrm{B}$

Which is not the correct statement:

Main source of lead is $\mathrm{PbS}$. It is converted to $\mathrm{Pb}$ by

(i) $\mathrm{PbS}\underset{∆}{\overset{\mathrm{Air}}{\to }}\mathrm{PbO}+{\mathrm{SO}}_2\underset{∆}{\overset{\mathrm{C}}{\to }}\mathrm{Pb}+{\mathrm{CO}}_2$

(ii) $\mathrm{PbS}\underset{∆}{\overset{\mathrm{Air}}{\to }}\mathrm{PbO}+\mathrm{PbS}\stackrel{∆}{\to }\mathrm{Pb}+{\mathrm{SO}}_2$

Self reduction process is