Please choose the correct answer to the 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?

Answer1: The baseball strikes the roof. Answer2: The roof of the car dents. Answer3: The paint cracks and chips. Answer4: The exposed metal rusts.

Answer format: answer1/answer2/answer3/answer4