The correct answer is A) It was done by executive order.
Harry Truman passed Executive Order 9981 on July 26, 1948. This desegregated the US military. Truman felt that this was a necessity after the way that one million African American men served bravely in the US military during World War II. This included specific groups like the Tuskegee Airmen who helped complete roughly 1,000 successful missions.
