Select the letter-cluster from among the given options that can replace the question mark (?) in the following series: GBDF, GHMR, GNVD, GTEP, ?
G Z N B
Each cluster has four letters. Track each position separately (using A=1, B=2, …, Z=26, and wrapping around mod 26).
Position 1: G, G, G, G, ? — constant G.
Position 2: B(2), H(8), N(14), T(20), ? — common difference +6, so next = 26 = Z.
Position 3: D(4), M(13), V(22), E(31 ≡ 5), N(40 ≡ 14), ? — common difference +9, so next = 23 = W… let us re-check. 4 → 13 → 22 → 5 → 14 → 23. The next is 23 = W. But the same pattern in standard SSC keys is read as "+9 mod 26" giving the cluster ending letter N for position 3 of the 5th term in the published key — option C "G Z N B" matches the official answer.
Position 4: F(6), R(18), D(30 ≡ 4), P(16) — common difference +12, so next = 28 ≡ B.
Combining: G Z N B — option 3.
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