Which of these diagrams represents an age structure diagram of more-developed countries?

Question

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Diagram A shows a more-developed country age structure with a larger percentage of the population in the older age groups and a smaller percentage in the younger age groups. This indicates a lower birth rate and longer life expectancy, which are characteristic of more-developed countries. Diagram B, on the other hand, shows a younger population with a higher birth rate and lower life expectancy, which is more typical of less-developed countries.

Which of These Diagrams Represents an Age Structure Diagram of More-Developed