According to 2009 data on the U.S. population which of the following was correct?
a. Adults had higher labor-force participation rates and higher rates of unemployment compared to teenagers.
b. Adults had higher labor-force participation rates and lower rates of unemployment compared to teenagers.
c. Adults had lower labor-force participation rates and lower rates of unemployment compared to teenagers.
d. Adults had lower labor-force participation rates and higher rates of unemployment compared to teenagers.