Matching Column Type

Answer

A-p,q,r ; B-r,s; C-p,r,s; D-q,r

Explanation

Siderite `(FeCO_3)` is a carbonate ore of Fe which undergoes carbon reduction for commercial extraction of iron.
Galena (PbS) undergoes carbon reduction for commercial extraction of lead and electrolytic refining.
Calamine is `ZnCO_3` a carbonate ore which undergoes carbon reduction for commercial extraction of zinc and electrolytic refining.
d) Magnetite is an ore of iron, which undergoes carbon reduction for commercial extraction of iron.