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A
united states
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B
United States — both words capitalized, as it is the proper name of the country (United States or United States of America)
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C
United states
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D
united States
Why this is the answer
UNITED STATES — BOTH words are capitalized because it is the proper name of the country. UNITED (U-N-I-T-E-D), STATES (S-T-A-T-E-S). It may also appear as 'United States of America.' The USCIS writing test requires correct capitalization of proper nouns, including country names. Errors to avoid: lowercasing either word ('united states,' 'United states,' 'united States'). 'United States' is among the most common terms on the citizenship test and must be capitalized correctly.
Source: USCIS Writing Test — United States