Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TALT, YAGT, YFGO, DFBO, DKBJ, ?
Answer & explanation
Correct answer: option 2

Explanation:
TALT, YAGT, YFGO, DFBO, DKBJ, ?
The logic followed here is :
T → (+5) → Y → (+5) → Y → (+5) → D → (+5) → D → (+5) → I
A → (0) → A → (0) → F → (0) → F → (0) → K → (0) → K
L → (-5) → G → (-5) → G → (-5) → B → (-5) → B → (-5) → W
T → (0) → T → (0) → O → (0) → O → (0) → J → (0) → J
So, the letter-cluster that replaces the (?) to complete the series is "IKWJ"