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.

[Q]: Question: Dwayne Johnson is much stronger than Kevin Hart because he exercises more and therefore his muscles have grown 
 Option1: larger or 
 Option2: smaller. 
 Explanation: Exercising muscles increases their size, and bigger muscles have greater strength.
[A]: larger or


[Q]: 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.
[A]: United States


[Q]: Question: If the number of offspring of an species is increased, what happens to the number of traits they have in common with one another? 
 Option1: they will have more traits in common 
 Option2: they will have less traits in common 
 Explanation: Natural selection is the process by which living things with beneficial traits produce more offspring, so their traits become more common over time.
[A]:
they will have more traits in common