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A
lincoln was the president
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B
Lincoln was the President.
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C
Lincon was the President
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D
Lincoln was the Presadent
Why this is the answer
CORRECT: 'Lincoln was the President.' — 'Lincoln' capitalized (proper noun/name), 'President' capitalized (title), correct spelling, and end punctuation. Errors to avoid: lowercase 'lincoln' and 'president,' misspelling the name ('Lincon' — correct is L-I-N-C-O-L-N), and misspelling 'Presadent' (correct is P-R-E-S-I-D-E-N-T). Abraham Lincoln, the 16th President, appears in citizenship test content; writing his name and the word 'President' correctly demonstrates the required writing ability.
Source: USCIS Writing Test — Lincoln was President