Explanation:

Let’s break it down:

- First, look at the pattern by columns:

- 1st letters: O ? N ? M ? ? ? K (seems to go back by 1 each time: O(N)(M)(L)(K))

- 2nd letters: H ? F ? D ? ? ? Z (back by 2 each time: H(F)(D)(B)(Z))

- 3rd letters: V ? S ? P ? ? ? J (back by 3 each time: V(S)(P)(M)(J))

- 4th letters: Y ? U ? Q ? ? ? I (back by 4 each time: Y(U)(Q)(M)(I))

Apply the same patterns for the question mark:

- 1st: M back 1 letter = L

- 2nd: D back 2 = B

- 3rd: P back 3 = M

- 4th: Q back 4 = M

So, the cluster is LBMM.

Let’s check all the options:

- Option 1: LAMM – Wrong, second letter should be B, not A.

- Option 2: LBMM – Correct, exactly matches the logic.

- Option 3: LBMP – Wrong, last letter should be M, not P.

- Option 4: LBPQ – Wrong, third and fourth letters wrong.