The Official Measure of Civilian Unemployment in the U

The official measure of civilian unemployment in the U.S. might be an understatement of actual unemployment because

A) some workers become discouraged and no longer are actively seeking work. These workers are not officially counted in the labor force, and consequently are not officially unemployed.
B) the official measure of civilian unemployment fails to account for very high levels of unemployment among active-duty military personnel.
C) the statistics do not count part-time employment the same way as from full-time employment, even though many part-time workers would prefer to be fully employed.
D) retirees are included in the labor force.