The baseball strikes the roof. The roof of the car dents. The paint cracks and chips. The exposed metal rusts.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Base your answer on the information below and on your knowledge of science. A baseball strikes the roof of a car and dents it. The paint on the roof begins to crack and chip, exposing the metal. The exposed metal on the roof rusts, eventually causing a small hole in the roof. Which event is a chemical change?
Possibilities:
- The baseball strikes the roof.
- The roof of the car dents.
- The paint cracks and chips.
- The exposed metal rusts.

The exposed metal rusts.