The correct answer is B. Zinc.
Galvanization is a process of applying a protective zinc coating to iron or steel, which helps to prevent corrosion. The zinc coating is applied by hot-dip galvanizing, which involves immersing the iron or steel in a bath of molten zinc. The zinc reacts with the iron or steel to form a zinc-iron alloy, which is very resistant to corrosion.
Copper, tin, and nickel are also metals that can be used to coat iron or steel, but they are not as effective as zinc at preventing corrosion. Copper is a good conductor of electricity, but it is not as strong as zinc. Tin is used to coat cans, but it is not as durable as zinc. Nickel is a strong and durable metal, but it is more expensive than zinc.
Therefore, the best metal to use for galvanization is zinc. It is effective at preventing corrosion, it is strong and durable, and it is relatively inexpensive.