You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

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. 
 Option1: United States 
 Option2: China 
 Explanation: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.
United States

Question: Eric adds gas to a 20ml container and Rita adds gas to a 10ml container. Which container holds more gas particles? 
 Option1: Rita 
 Option2: Eric 
 Explanation: In the larger container we will still have the same number of gas particles, but now they are filling a much larger space.
Eric

Question: John is from the US. When he visited a third world country, he noticed the use of energy resources there was 
 Option1: more 
 Option2: less. 
 Explanation: Richer nations use far more energy resources, especially fossil fuels, than poorer nations do.

less.