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A
All three sentences
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B
One out of up to three sentences
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C
Five sentences
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D
Ten sentences
Why this is the answer
To pass the reading portion of the naturalization test, the applicant must read aloud one sentence correctly out of up to three attempts. The USCIS officer shows sentences built from the published reading vocabulary, and the applicant reads them. Minor mistakes that do not interfere with meaning — such as small pronunciation errors or pauses — are generally acceptable, but the applicant must convey that they can read English. Knowing the format (one correct reading out of three) helps applicants approach the test with less anxiety. Reading comprehension of the vocabulary in context is the underlying skill.
Source: USCIS Reading Test — Passing Requirement