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A
United Stats
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B
United States
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C
United Staits
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D
Unitid States
Why this is the answer
UNITED STATES is on the USCIS WRITING VOCABULARY list under PLACES. The correct spelling is 'U-N-I-T-E-D S-T-A-T-E-S.' A common dictation sentence is 'I want to be a citizen of the United States' or 'The United States has fifty states.' On the writing test, the applicant must write one of up to three dictated sentences correctly. Practicing the spelling of 'United States,' which appears frequently in dictation sentences, is valuable preparation. Small errors that still let the sentence be understood are generally acceptable.
Source: USCIS Writing Vocabulary — Places: United States