<em>The correct option is b) Shift from a primarily rural and agricultural focus to that of increasing urbanization with industrialization growing in the urban areas.</em>
Explanation:
The Industrial Revolution can be described as the era in which the development of industries took place. Farmers started to move to urban areas in search of jobs in the industries to improve their standard of living.
Before the Industrial Revolution, people focused more on agriculture and farming. But as soon as the industries began to set up in the Urban areas, people migrated from the rural areas to the urban areas in search of better jobs.
It was very dry and flat. In 1862, the Homestead Act was passed. The government helped people to settle on the Great Plains. The government sold adults 160 acres of land for a small amount of money.
