Answer:
The correct answer is B. The industrial growth of the 20th century generally resulted in a higher standard of living for most Americans.
Step-by-step explanation:
The industrial growth of the 20th century, especially in the cities of the Midwest like Cleveland or Detroit, was the last step in the industrial development of the nation, motivated mainly by the First World War and the Roaring Twenties, where first by necessity of war material and then due to the economic impulse of the time, large companies began to develop. Thus, the nation's economic growth promoted industrial development, and in turn companies began to take on larger numbers of workers.
After the Great Depression and World War II, this momentum was picked up again. Thus, greater numbers of workers were introduced to the productive system, which ended up providing these people with better living conditions, by including them in economic systems with a stable salary and positive working conditions.