Which of the Following Statements About the Long-Term Labor Supply

Which of the following statements about the long-term labor supply is FALSE?

A) The growth rate of the working-age population has been declining since 1980.
B) Technology changes, such as the introduction of air conditioning in the mid-20^th century, can have an impact on regional labor supply.
C) Immigration provides an insignificant proportion of the overall growth of the workforce.
D) Programs funded by payroll taxes, such as Social Security and Medicare, face problems from a slowdown in the growth of the working-age population.