Let's break out all the answers. The correct way to put the country is "United States". You can eliminate answers B & D. Now let's look at A & C. You can see that C has the proper "The United States" while A doesn't. So therefore, your answer is C.
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The principle of holism declares that the whole is more than the sum of its parts. A holistic perspective looks at each component part and how it is connected with one another to create a cohesive whole