What was a result of the industrial revolution? most people became farmers. most people moved to the countryside. america became more rural. population began to shift from the country to cities.

Let's look at all the answers in turn:

Most people became farmers.
-this is false: industrial revolution pushed more people to be factory workers and not farmers

Most people moved to the countryside.
-this is also false: most people moved to cities, where work in factories was available.

 America became more rural.
-this is again false, it became more urban instead

 Population began to shift from the country to cities.
-this is the correct answer!
This shift had to do with the amount of work available in the cities.