Which statement best describes the demographic effect of industrialization in the U.S.? O Most people migrated from urban to rural areas.
O Labor union membership decreased.
O Economic opportunity caused rapid city growth.
o Immigration to the U.S. declined significantly.

Economic opportunity caused rapid city growth.

Explanation:

The demographic effect of industrialization in the United States is that "Economic opportunity caused rapid city growth." This is evident in that industrialization leads to more availability of works, which in turn leads to workers moving to industrialized areas in the cities, thereby boosting and causing rapid growth in the city, both in terms of urbanization and industrialization simultaneously.

The answer is D. They waited before invading france on APEX