Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. C G K, G K O, K O S, O S W, ?
SWA
Pattern: Each letter advances by +4 from the corresponding letter of the previous group (with the alphabet wrapping around after Z).
Group 1: C, G, K → +4 → G, K, O (Group 2)
Group 2: G, K, O → +4 → K, O, S (Group 3)
Group 3: K, O, S → +4 → O, S, W (Group 4)
Group 4: O, S, W → +4 → S, W, A (W +4 = A, wrapping around).
Hence, the correct answer is SWA.
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