Which letter-cluster will replace the question mark (?) in the following series?
GXB, JVD, MTF, PRH, ?

Given: GXB, JVD, MTF, PRH, ?

Logic: 1st letter + 3, 2nd letter - 2 and 3rd letter + 2 place.

For, 1st letter

G + 3 = J, J + 3 = M, M + 3 = P, P + 3 = S

For, 2nd letter

X - 2 = V, V - 2 = T, T - 2 = R, R - 2 = P

For, 3rd letter

B + 2 = D, D + 2 = F, F + 2 = H, H + 2 = J

So, the missing term is SPJ.

Thus, correct option is (b).