Why is urbanization associated with the Industrial Revolution?

A. The expansion of family farms refocused the nation on agriculture.
B. The concentration of factories in cities brought job opportunities.
C. Settlers expanded the frontier west of the Mississippi River.
D. Immigrants settled in large cities and brought cultural diversity.

2 answers

Which of those choices makes sense to you?
The wrong ones are so wrong there is no need to know the right one :)