A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

QRST, UVWX, YZAB, CDEF, ?

QRST, UVWX, YZAB, CDEF, ?

Logic: Each letter add +4 in alphabet order.

First letter:  Q + 4 → U, U + 4 → Y, Y + 4 → C +4 → G

Second Letter: R + 4 → V, V + 4 → Z, Z + 4 →D, D + 4 → H

Third Letter: S + 4 → W, W + 4 → A, A + 4 → E, E + 4 → I

Fourth Letter: T + 4 → X, X + 4 → B, B + 4 → F, F + 4 → J

Thus, the correct option is: (b)