B.) Americans should buy bonds to prevent our enemies from harming the nation.
Explanation:
The poster effectively raises awareness of national security, in that, the government needs funds to efficiently raise, train, and equip an army for defense abroad so that the homeland is not attacked. War bonds were high interest loans to the government that is usually bought by citizens in the country, in an effort to raise money for certain activities, which, in this case, is for war.
