Task: Question Answering
Input (English): Paragraph: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.
 Question: Chris is studying two countries. He finds that China has half as many factories putting out fossil fuels into the air than the United States. Based on this information, the factories in _____ are causing more air pollution. 
 Choices: A)United States 
B)China
Output (English): United States