Select the option that will fill in the blank and complete the given series.

CYB, FUG, IQL, LMQ, OIV, _____

REA

Explanation:

CYB, FUG, IQL, LMQ, OIV, _____

The logic followed here is :

C → (+3) → F → (+3) → I → (+3) → L → (+3) → O → (+3) → R

Y → (-4) → U → (-4) → Q → (-4) → M → (-4) → I  → (-4) → E

B → (+5) → G → (+5) → L → (+5) → Q → (+5) → V → (+5) → A

So, the letter-cluster that replaces the (?) to complete the series is "REA'