How does the american work ethic affect gdp

"Americans generally believe that work is good for people. Many grow up believing they can be successful. These beliefs lead Americans to work hard. On average, Americans work longer hours and take less vacation than people in other developed countries. All this helps Americans to produce more."

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.