Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of-

Correct option is B

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of Zinc. Zinc is more reactive than iron. This means it corrodes more easily than iron when exposed to oxygen and moisture (the culprits behind rust). The zinc coating acts as a physical barrier between the iron and the environment, preventing oxygen and moisture from reaching the iron surface. Even if the zinc coating gets scratched or damaged, it offers sacrificial protection. Zinc corrodes first, preventing the iron underneath from rusting. This is because zinc acts as a sacrificial anode, giving up electrons to the iron (cathode) and corroding preferentially.