The correct option is NCOESMH.

Let's analyze the coding pattern by comparing the letters of the word CHHAPAK with its coded form DJKEUGR step-by-step.

We first write down the alphabetical positions of the letters in both words:
C = 3, H = 8, H = 8, A = 1, P = 16, A = 1, K = 11
D = 4, J = 10, K = 11, E = 5, U = 21, G = 7, R = 18

Now, let's find the difference between the alphabetical position of each letter in the original word and its corresponding letter in the code:
C → D : 3 + 1 = 4 (Difference is +1)
H → J : 8 + 2 = 10 (Difference is +2)
H → K : 8 + 3 = 11 (Difference is +3)
A → E : 1 + 4 = 5 (Difference is +4)
P → U : 16 + 5 = 21 (Difference is +5)
A → G : 1 + 6 = 7 (Difference is +6)
K → R : 11 + 7 = 18 (Difference is +7)

The pattern is that the $i$-th letter of the word is shifted forward by $i$ positions in the alphabet.

Following this exact pattern, let's determine the code for the word MALANGA:
M (position 13) + 1 = 14 → N
A (position 1) + 2 = 3 → C
L (position 12) + 3 = 15 → O
A (position 1) + 4 = 5 → E
N (position 14) + 5 = 19 → S
G (position 7) + 6 = 13 → M
A (position 1) + 7 = 8 → H

Combining these letters together, we get the code NCOESMH.