Which of the following terms will replace the question mark (?) in the given series?
NLJ, JHF, FDB, BZX,?

Correct option is A

Observing the series:
NLJ, JHF, FDB, BZX, ?
Differences:
First letter of each term –
N – 4 = J
J – 4 = F
F – 4 = B
B – 4 = X
Second letter of each term-
L - 4= H
H - 4= D
D – 4 = Z
Z - 4= V
Third letter of each term –
J - 4 = F
F – 4 = B
B – 4 = X
X – 4 = T
Therefore, next term XVT
So, option (a) XVT.