Zinc-coated iron is used in the design of automobiles because:
Zinc can be coated onto iron easier than other metals.
It makes the automobile lighter in weight.
Zinc is abundantly available than any other metal.
It is more resistant to corrosion.
The correct option is D It is more resistant to corrosion.
Iron is coated with zinc to protect it from corrosion. Zinc-coated iron has more resistance to corrosion than simple iron. That is why it is used in the design of automobiles and also in the construction of bridges.