The correct option is
A Self-reduction and carbon reduction
Tinstone or cassiterite -
SnO2 - is the principal ore of tin. It is subjected to gravity separation and once some
heavy impurities are removed, the magnetic impurities are removed by magnetic separation.
After a series of concentration processes, the concentrated ore obtained is called "Black tin".
This is a historical legacy name that has survived from the mining days in Devon and Cornwall (both in England).
Black tin is the raw ore of tin, usually concentrated/dressed cassiterite, which is sold by a tin mine to a smelting company.
contrast this with "white tin," which is the refined, metallic tin produced after smelting.
Black tin is smelted with anthracite coke and lime. Lead is subjected to self-reduction.