Select the letter-cluster from among the given options that can replace the question mark (?) in the given series.

DPX, EQY, FRZ, GSA, ?

Given: DPX, EQY, FRZ, GSA, ?

Logic: Each letter is increased by =1 places in English alphabet.

1st Letter Pattern:
D + 1 = E; E + 1 = F; F + 1 = G; G + 1 = H
2nd Letter Pattern:
P + 1 = Q; Q + 1 = R; R + 1 = S; S + 1 = T
3rd Letter Pattern:
X + 1 = Y; Y + 1 = Z; Z + 1 = A; A + 1 = B
So, the Next term is  HTB
Thus, the correct option is (c) HTB