Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
BZC, EXF, HVI, KTL, ?
1
ONR
2
MOR
3
NRO
4
ORN
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
BZC, EXF, HVI, KTL, ?