Correct option: B.The surface of the object changing from an element to a compound
b. The surface of the object changing from an element to a compoundExplanation:Corrosion is a natural process, which converts a refined metal to a more chemically stable form, such as its oxide, hydroxide, or sulfide.The corrosion process is a chemical change because two substances react together to form a new substance.When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide.
The surface of an object is changing from an element to any compound such as oxide, hydroxide, sulfide etc.