Which of the following best explains why the population of U. S. urban areas increased 20 percent between 1865 and 1900?
A. The federal government offered people money and housing to live in urban areas.
B. Many foreign immigrants and people from rural areas moved into the cities to find jobs.
C. Many people felt that it was safer to live in the city than in rural areas.
D. The labor unions in many cities guaranteed jobs to people who moved to urban areas.

C. The labor  unions in many cities guaranteed jobs to people who moved to urban areas.

Explanation:

The growth of industrialization in the 1800s was an open opportunity to the the country side to develop themselves economically. By the year 1920, the population in the cites of America was the most populated cities than any other country.

The labor  unions in many cities guaranteed jobs to people who moved to urban areas best explains why the population of U.S. urban areas increased 20 percent between 1865 and 1900.

Nearly 11 million people from the urban areas filled the rural places motivated by the development of industrialization. And the need for workers and better wages helped them survive in the society and help their family.

answer; their own memory abilities;