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A
capitol
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B
capital — meaning the city that is the seat of government (Washington, D.C. is the capital); note 'capitol' with an 'o' refers to the building where Congress meets
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C
capitel
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D
capatal
Why this is the answer
CAPITAL (with an 'A') is correct here — it means the city that is the seat of government (Washington, D.C. is the capital of the United States). Note the distinction: CAPITAL (city/seat of government) vs CAPITOL (with an 'O' — the building where Congress meets). Memory aid: the CapitOl building has a dОme (both have 'O'). The USCIS writing test may use 'capital'; spelling it correctly (C-A-P-I-T-A-L) demonstrates the required writing ability. This capital/capitol distinction is a common point of confusion.
Source: USCIS Writing Test — Capital