Recall the Application About Declining U

Recall the Application about declining U.S. labor force participation since 1999 to answer the following question(s) .
-According to this Application, one explanation for the decline in the U.S. labor force participation rate since 1999 is

A) higher college enrollment.
B) the increase in foreign ownership of U.S.-based companies.
C) sluggish economic growth that resulted in more discouraged workers.
D) the growing number of workers who have postponed retirement.