Final answer:
The United States has a mature demographic structure, indicating a balanced distribution among age groups and signifying that it is an economically developed country with a shifting population towards elderly demographics. The correct answer is B.
Step-by-step explanation:
The United States has what kind of demographic structure? The correct answer is B. Mature. This classification indicates a fairly even distribution of individuals across different age groups, which is typical of economically developed countries like the United States.
Evidence suggests that high-income nations, including the US, are facing a demographic shift where the elderly population will form a larger share of the population. In contrast, economies that are still developing tend to have a younger demographic structure, with higher proportions of youth and relatively fewer elderly individuals. However, even these countries are expected to see aging populations in the coming decades.
It's notable that distinctions in demographic structure often parallel differences in industry structure and economic institutions. For instance, high-income economies have a small percentage of GDP from agriculture and high levels of urbanization, whereas the rest of the world has higher proportions of agriculture in their GDP and varying degrees of urbanization.