Answer:
D- A decline in manufacturing within those regions is the correct answer.
Explanation:
Many developed regions, particularly in the United States, saw a decline in traditional manufacturing industries in the late 20th century. This led to a shift towards service industries, including education, health care, and information technology, as new sources of economic growth and job creation. These service industries often require a highly skilled and educated workforce, and they tend to be less reliant on physical capital and more on intellectual capital. As a result, these regions were able to reinvent themselves as centers for knowledge-based industries and attract new businesses, workers, and investment.