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.
NEVER : PGXGT :: BELOW : DGNQY :: AGAIN : ________

Logic: Each letter is taken two steps forward.

As,

N+2=P, E+2=G, V+2=X, E+2=G, R+2=T

And

B+2=D, E+2=G, L+2=N, O+2=Q, W+2=Y

Similarly,

A+2=C, G+2=I, A+2=C, I+2=K, N+2=P

So, CICKP is the correct answer.