Final answer:
The U.S. military units were segregated during the Korean War and the Booming 1950s. Therefore, the correct option is d. segregated
Step-by-step explanation:
The Korean War and the Booming 1950s saw all U.S. military units d. segregated. At the outbreak of World War II, the military was still officially segregated, and it was not until after the war that the branches of the military began to integrate. The process of integration was gradual, and by the mid-1950s, full integration of the U.S. military was achieved.