The correct answer is:
A. the contributions of American women during World War II
President Truman issued Executive Order 9981 in 1948, which aimed to end segregation in the military and ensure equal treatment and opportunity for all service members. The contributions of various groups, including American women, during World War II helped to highlight the need for civil rights reforms and played a role in influencing Truman's decision. The significant participation and impact of women (and other marginalized groups) in the war effort underscored the contradictions between their contributions and the segregated and unequal treatment they faced.