Answer: The correct answer is:
- OC. They raised money for the cost of military operations.
Liberty Bonds were a form of government debt sold to citizens to finance the United States' involvement in World War I. These bonds were an essential source of funding for the war effort, as they raised billions of dollars to pay for the cost of military operations, such as the production of weapons, ammunition, and supplies, as well as the deployment of troops overseas. The bonds also helped to mobilize public support for the war by encouraging Americans to invest in their country's future and to show their patriotism by supporting the war effort financially.