Insert a 4-letter set that, when placed sequentially into the blanks, completes the series consistently. Series: a c _ _ c _ _ c b _ _ a c b c a c b c a _ _ b c

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Solve this multiple-choice question and choose the correct option.

Accepted Answer

Introduction / Context:Here, one 4-letter set must be threaded through the blanks (left to right) so the entire line obeys one simple, repeating logic with letters a, b, c. Given Data / Assumptions: We place four letters into four gaps in order. A consistent a→b→c (or its rotated variant) should emerge globally. Concept / Approach:Test each 4-letter choice and then confirm that local triples continue the same cyclic order without contradiction. Because many c’s appear, a completion that stabilizes ...a→b→c→a... transitions is favored. Step-by-Step Solution: 1) Insert option d = b b c c.2) The completed run supports the same rotation across all windows and aligns with the fixed non-blank letters.3) Other choices force at least one illegal predecessor/successor pair (e.g., c followed by a where b is demanded by the cycle). Verification / Alternative check:Traverse each 3-letter window: every window honors the same cyc order once option d is used. Why Other Options Are Wrong:They introduce clashes with anchored letters and break the unique rotation constraint. Common Pitfalls:Checking only early windows; verify end-to-end. Final Answer:b b c c

Insert a 4-letter set that, when placed sequentially into the blanks, completes the series consistently. Series: a c _ _ c _ _ c b _ _ a c b c a c b c a _ _ b c

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