The answer you're looking for is C. Special Purpose Government. Hope this helps!
Diplomacy can be used because diplomats create treaties and agreements on problems and these treaties resolve problems in such a way that it benefits both sides. If it doesn't benefit both sides, then it's usually as a result of a war effort. Good diplomats for example like Henry Kissinger can completely turn the way a politician behaves, like he opened China a bit to the west even though it was believed to be impossible.
Capital or entrepreneurship
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About one-third increase to the size of the United States. The states of Nevada, Arizona, California, Utah and some parts of New Mexico and the Gadsden purchase completes the southern parts of Arizona and New Mexico. This land is from Mexico acquired by the United States.