The correct response is:
B
demobilizing the military and returning to a peace-time economy.
After World War I, one of the key concerns for the United States was how to effectively demobilize its military forces and transition from a wartime economy back to a peacetime economy. This included managing the return of soldiers and dealing with potential economic challenges and unemployment during the transition. While other options mentioned some relevant issues, demobilization was a primary focus during this period.