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dinahrosesoto
The answer is b because it goes through a chemical reaction called oxidation. Therefore leading it to rust.

Answer:

Undergone a chemical change

Explanation:

When a metal rusts, it has undergone a chemical change because : -

  1. Reddish brown appearance on the metal.
  2. Metal will become brittle, fragile, progressive.

Moisture has air, water and acid ( chemicals ), which react with metal to form rust, hence it undergone a chemical change.