Task: Question Understanding
Input (English): Question: A company plants trees on a bare hillside. Which of these is the BEST reason for planting the trees? (A) The trees provide oxygen for the soil. (B) The trees prevent soil from washing away. (C) The trees make shade for animals living there. (D) The trees cause animals to move to other places.?
Output (English): trees, bare, hillside., reason, planting, trees?