Task: Question Answering
Input (English): Some of the new cars being made can run on a renewable fuel that is made mostly from corn. Scientists are developing even more renewable fuels to replace gasoline. Why are renewable fuels most likely becoming more important?  
 (A) Renewable fuels release less energy. (B) Car fuel tanks are being made smaller. (C) The demand for gasoline is decreasing. (D) Nonrenewable fuel supplies are limited.
Output (English): D