The correct statement is: It inspired a mass movement of people to the country.
The Industrial Revolution drove rural-to-urban migration, as people sought employment in burgeoning industrial centers. This influx transformed agrarian societies into urban landscapes, defining the North's demographic shift. The other statements are partially accurate or inaccurate; industrialization led to larger structures, improved transportation, and, notably, pollution in cities due to widespread coal use in factories, rather than the construction of smaller buildings or a shift away from public transportation.