Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
QSD, YAL, GIT, OQB, ?

Given: QSD, YAL, GIT, OQB, ?

Logic: Letters are increasing + 8 place.

Q + 8 = Y, Y + 8 = G, G + 8 = O, O + 8 = W

S + 8 = A, A + 8 = I, I + 8 = Q, Q + 8 = Y

D + 8 = L, L + 8 = T, T + 8 = B, B + 8 = J

So, the missing term is WYJ.

Thus, correct option is (d).