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A
Having no cost
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B
Having liberty and independence — the ability to act, speak, or think without restrictions; a core American value
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C
Not working
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D
Empty or available
Why this is the answer
FREE (in the civic sense) and FREEDOM are on the USCIS CIVICS VOCABULARY list. In the context of American democracy, 'free' means having LIBERTY — the ability to live, speak, and act without oppression. Common reading test sentences: 'People have the right to be free.' 'America is the land of the free.' 'We are free.' The phrase 'land of the free' comes from the National Anthem ('The Star-Spangled Banner') written by Francis Scott Key. FREEDOM is the corresponding noun: 'Freedom of speech,' 'Freedom of religion,' 'Freedom of the press' are specific freedoms protected by the First Amendment. Other meanings of 'free' in English: costing nothing (free admission), available (free time), clear of obstacles. On the USCIS test, free is ALWAYS used in the liberty/rights sense, not the cost or availability sense.
Source: USCIS Reading Vocabulary — Civics: free/freedom