Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
ACL, DFO, GIR, JLU, MOX, ?
Answer & explanation
Correct answer: option 1

Explanation:
ACL, DFO, GIR, JLU, MOX, ?
The logic followed here is :
A → (+3) → D → (+3) → G → (+3) → J → (+3) → M → (+3) → P
C → (+3) → F → (+3) → I → (+3) → L → (+3) → O → (+3) → R
L → (+3) → O → (+3) → R → (+3) → U → (+3) → X → (+3) → A
So, the letter-cluster that replaces the (?) to complete the series is "PRA"