Which of the following letter-number-clusters will replace the question mark (?) in the given series to make it logically complete?
CJL 11, DKM 15, ELN 19, FMO 23, ?​

Series: CJL 11, DKM 15, ELN 19, FMO 23, ?

Logic: Each letter + 1, Number = +4

First letter: C +1 → D, D +1 → E, E +1 → F, F +1 → G
Second letter: J +1 → K, K +1 → L, L +1 → M, M +1 → N
Third letter: L +1 → M, M +1 → N, N +1 → O, O +1 → P
Number pattern:
11, 15, 19, 23 → +4 each time → next = 27​​

So next term is GNP 27.

Thus, correct option is (d).