In the given letter-cluster pairs, the first letter-cluster is related to the second letter-cluster following a certain logic. Study the given pairs carefully, and from the given options, select the pair that follows the same logic.
MON : PLQ
KII : NFW

Given :  MON → PLQ,. KII → NFW

Logic : 1st  and 3rd letter increasing by 3, 2nd letter decreasing by 3.
First Pair: MON → PLQ
M ( 13 + 3) = 16 → P
O (15 - 3) = 12 → L 
N ( 14 + 3) = 17→ Q
Thus, the pattern for MON → PLQ
Second Pair: KII → NFW
K(11 + 3) = 14 → N
I(9 - 3) 6 → F  
T( 20 + 3) = 23 → W
The pattern for KII → NFW

Similarly: by option (c)

P(16 + 3) = 19  $$\rightarrow$$S

E(5 - 3) =  2  $$\rightarrow$$B

N(14 +3)  = 17  $$\rightarrow$$Q

Thus, correct option is (c).