From the given options, Select the letter-cluster that can replace the question mark (?) in the following series.

ZAB, DEF, HIJ, NOP, ?

Given: ZAB, DEF, HIJ, NOP, ?

Logic: 1st and 2nd letters + 4, 3rd and 4th letters + 6

Z + 4 = D
D + 4 = H
H + 6 = N
N + 6 = T

A + 4 = E
E + 4 = I
I + 6 = O
O + 6 = U

B + 4 = F
F + 4 = J
J + 6 = P
P + 6 = V

So the final letter-cluster is: TUV

Thus, the correct option is (d) TUV