What did Rosen mention in The End of Men regarding women and the labor force in the U.S. in 2010?
a) Women were the majority of the labor force in the U.S. in 2010
b) The majority of managers in the U.S. were women in 2010
c) This was the first time in U.S. history that women were the majority of the labor force
d) The trend of women dominating the labor force and management positions was highlighted by Rosen in The End of Men