-Examine the Dependency Ratio Trends for the Regions in This

-Examine the dependency ratio trends for the regions in this figure.Which of the following best explains the recent increase in the dependency ratio in developed countries?

A) As per capita income rises,people marry at a younger age.
B) More people have to work to keep per capita incomes high.
C) Life spans are longer resulting in an increase in elderly citizens.
D) As per capita income rises,family size increases.