Task: Question Understanding
Input (English): Question: Matt had two types of dog food and gave his dog both types of food at the same time every day. He recorded his observations. What question is best answered by this experiment? (A) What time of day does Matt's dog eat the most? (B) What dog food is of better quality? (C) How quickly does Matt's dog eat? (D) What type of food does Matt's dog prefer?
Output (English): two, types, dog, food, dog, food, every, day., question, answered