As the Share of Population Age 65 and Older Expands

As the share of population age 65 and older expands in high-income countries like Japan and the United States,

A) the tax burden on current workers will tend to decrease.
B) the tax burden on current workers will tend to increase.
C) the productivity of the population will tend to increase,leading to higher rates of economic growth.
D) government expenditures on health care and retirement benefits for the elderly will tend to decrease.