Which of the Following Has Been the Bigger Contributor to Increases

Multiple Choice

Which of the following has been the bigger contributor to increases in the quantity of labor in the Unites States during the past 50 years?

A) The proportion of men taking paid jobs has trended up.
B) The proportion of women taking paid jobs has trended up.
C) The proportion of young adults entering college has trended down.
D) The proportion of seniors taking early retirement has trended down.
E) Total population growth has increased dramatically.