The correct option is "C" since more Americans who lived and worked in the country decided to move to the cities as a result of the Industrial Revolution demand of workers which caused a great impact on American society. This event was produced by a shift from agrarian to an industrial economy. Manual labor industry became more technical. Consequently, products started to be produced at large scales thanks to machine-based manufacturing which allowed the increase of production as well as the economic growth of the United States.
