The correct answer is C. Zinc white.
Zinc white is a white pigment that is used in paints for corrosive resistance. It is a zinc oxide that is produced by heating zinc in air. Zinc white is a very stable pigment and is not affected by acids or alkalis. It is also a very opaque pigment, which means that it can cover a wide range of surfaces.
White lead is a white pigment that is made from lead carbonate. It is a very toxic pigment and is no longer used in paints. Ferrous oxide is a red pigment that is made from iron oxide. It is a very stable pigment and is not affected by acids or alkalis. However, it is not as opaque as zinc white and is not as resistant to corrosion. Red lead is a red pigment that is made from lead oxide. It is a very toxic pigment and is no longer used in paints.
Zinc white is the best choice for a pigment to use in paints for corrosive resistance because it is a stable, opaque, and non-toxic pigment.