Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?
JPG, FLC, BHY, XDU, ?
Answer & explanation
Correct answer: option 3

Explanation:
JPG, FLC, BHY, XDU, ?
The logic followed here is :
J → (-4) → F → (-4) → B → (-4) → X → (-4) → T
P → (-4) → L → (-4) → H → (-4) → D → (-4) → Z
G → (-4) → C → (-4) → Y → (-4) → U → (-4) → Q
So, the letter-cluster that replaces the (?) to complete the series is "TZQ"