Pb and Sn are extracted from their chief ore by `:`

Options

A. carbon reduction and self reductiion respectively.
B. self reduction and carbon reduction respectively.
C. electrolysis and self reduction respectively.
D. self reduction and electrolysis respectively.

Answer

2

Explanation

`PbS+2PbOrarr3Pb+SO_(2)("self reduction")`
`SnO_(2)+C rarrSn+CO("carbon-reduction")`
`SnO_(2)+2COrarrSn+2CO_(2)`