Please choose the correct answer to the question: A large rock breaks into small pieces within 10 years. Which process is most likely responsible for breaking the large rock into small pieces within 10 years?

Answer1: steady winds blowing throughout the years Answer2: gentle rain falling during each spring and fall Answer3: lack of rain falling during a four-year drought Answer4: water repeatedly freezing and thawing in a crack

Answer format: answer1/answer2/answer3/answer4
Answer: answer4