Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.
NAPE : MZOD :: DULL : CTKK :: KIND : ?

The correct answer is JHMC.

Let us analyze the relationship between the letter-clusters by looking at the positions of the letters in the English alphabet (where A = 1, B = 2, ..., Z = 26):

First pattern: NAPE : MZOD
- N (14) - 1 = M (13)
- A (1) - 1 = Z (26) (wrapping around the alphabet)
- P (16) - 1 = O (15)
- E (5) - 1 = D (4)
Each letter in the first cluster is shifted backward by 1 position (-1) to obtain the corresponding letter in the second cluster.

Second pattern: DULL : CTKK
- D (4) - 1 = C (3)
- U (21) - 1 = T (20)
- L (12) - 1 = K (11)
- L (12) - 1 = K (11)
This confirms the "-1" pattern for each letter.

Applying the same logic to KIND:
- K (11) - 1 = J (10)
- I (9) - 1 = H (8)
- N (14) - 1 = M (13)
- D (4) - 1 = C (3)

Combining these letters gives the cluster JHMC.