Answer:
There were a lot of jobs and higher wages in cities where industrialization was taking place. New products and goods hit the market, as well as countless new technologies.
Punchcard ballots were discontinued because too many votes were done incorrectly and needed a re vote because they were not punched correctly.
I want to say "A" because the overcrowding would indeed raise the population and could lead to urbanization of rural lands. Hope it helped :)
