Task: Question Answering
Input (English): While hiking last year, Mike saw a large boulder next to a mountain trail. The boulder had no cracks. While hiking on the trail this year, he saw two large cracks in the boulder. Which of the following most likely caused these cracks to form?  
 (A) shaking from high winds (B) pressure from flowing water (C) erosion due to falling rain and snow (D) weathering due to freezing and thawing
Output (English): D