Given the question: Billy is an animal, but he is alergic to trees. He hates them very much.  Still, he wants to have a picnic and can't stand the idea of buying food from a restaurant.  Where would he have his picnic? Choose the most suitable option to answer the above question. Options：  A. addidas  B. north america  C. cafe  D. outside  E. woodland
The answer is:
D