A columnist in the New York Times notes that the U.S. labor supply​ "in the next decade is expected to expand at less th

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A columnist in the New York Times notes that the U.S. laborsupply​ "in the next decade is expected to expand at less thanhalf the pace of the​ 1960s, 1970s and​ 1980s."
​Source: Eduardo​ Porter, "The Payoff inDelaying​ Retirement," New York
Times​,
March​ 5, 2013.
These changes in the growth rates in the U.S. labor supply arethe result of
A.
more retirements and fewer families beginning to have two wageearners.
B.
a drop in the immigrant population.
C.
an increase in the immigrant population.
D.
fewer people wanting to work because their incomes are highenough.