Sampson and Laub's Research on the Impact of World War

Sampson and Laub's research on the impact of World War II (WWII) on men's lives generally showed that

A) WWII served as a turning point for all American soldiers.
B) IQ was the biggest factor in finding work after the war.
C) WWII only had an impact on soldiers if they served overseas.
D) most of the positive effects of war on the lives of soldiers came through their experience overseas, in-service training, and access to programs like the GI Bill.