Let us assign numbers to each letter. The number will be the number of the letter in the alphabet; eg A = 1
CNW = 3,14, 24
ENV = 5, 14, 23
GOU = 7, 15, 22
IOT = 9, 15, 21
We can see that in each iteration:
The first letter moves forward by 2
The third letter moves back by 1
We also see that in every other iteration:
The second letter increases by 1
Now, following the same pattern,
9 + 2, 15 + 1, 21 - 1
11, 16 , 20 = KPS
The answer is B