Correct option is C
Given - G_KPN_RPUXY_BE_PI_MP
Logic = each letter increased by 7 in the group of 4 letters
explanation: By checking each options
option a
GQKP/NJRP/UXYL/BEDP/IPMP (first letter is increasing by 7 but second letter not)
option b
GJKP/NPRP/UXYF/BELP/ICMP(first letter is increasing by 7 but second letter not
option c
GJKP/NQRP/UXYP/BEFP/ILMP (follows perfectly)

option d
GQKP/NFRP/UXYD/BEPP/IAMP (first letter is increasing by 7 but second letter not
hence option c is correct.