US war bonds allowed citizens to loan money to the government to finance military efforts during the World Wars. This mechanism helped raise funds necessary for military supplies and operations, while also promoting patriotism. Thus, the correct answer to the question is option B: loaning money to the government.
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US war bonds helped finance the war by allowing citizens to loan money to the government, which was then used for military expenses. They were a means of patriotism that also helped manage inflation. Overall, they played a vital role in supporting the wartime economy. ;