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A
All 3 dictated sentences must be perfect
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B
At least one sentence out of up to three dictated sentences must be written acceptably to pass
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C
Five sentences must be written
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D
There is no minimum
Why this is the answer
USCIS WRITING PASSING REQUIREMENT: The officer dictates up to 3 sentences. The applicant must write AT LEAST 1 SENTENCE ACCEPTABLY to pass the writing component. This is the same threshold as the reading component (must read 1 out of 3 sentences aloud acceptably). STRATEGY: If you are unsure about a sentence, write it as clearly as you can — if you make an error, you still have additional sentences to demonstrate your ability. The full naturalization English requirement includes: Speaking English (demonstrated throughout the interview), Reading (read 1 of 3 sentences), and Writing (write 1 of 3 sentences). Some applicants (age 50+ with 20 years LPR or age 55+ with 15 years LPR) are exempt from the English requirement.
Source: USCIS Citizenship Writing Test — Minimum Requirement