steady winds blowing throughout the years gentle rain falling during each spring and fall lack of rain falling during a four-year drought water repeatedly freezing and thawing in a crack
I gave my students this multiple choice 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?

Only one answer is correct among these 4 choices:
- steady winds blowing throughout the years
- gentle rain falling during each spring and fall
- lack of rain falling during a four-year drought
- water repeatedly freezing and thawing in a crack

Could you tell me which one is correct?

water repeatedly freezing and thawing in a crack