Which of the following letter cluster will replace the blank (_____) in the given series?
IAL, JAK, KAJ, LAI, _____________

Correct option is D

Series: IAL, JAK, KAJ, LAI, _____

First Letter Pattern: I, J, K, L
Each first letter is increasing by +1 alphabetically.
Following this pattern, the next first letter after L would be M.
Second Letter Pattern: A, A, A, A
The second letter remains constant as A in each term.
Third Letter Pattern: L, K, J, I
Each third letter is decreasing by -1 alphabetically.
Following this pattern, the next third letter after I would be H.
Combining these observations, the next term should be: MAH
Correct answer: (d) MAH.