What should come in place of? in the given series based on the English alphabetical order?
ZHS, YER, XBQ, WYP, ?

Given:

ZHS, YER, XBQ, WYP, ?

Logic: 1st -1, 2nd -3 and 3rd - 1
First letter = Z - 1= Y, Y - 1= X, X - 1 = W, W - 1 = V
Second letter = H - 3= E,E - 3= B, B - 3 = Y, Y - 3 = V
Third letter = S - 1= R, R - 1 = Q, Q - 1= P, P - 1 = O
? = VVO

Correct answer is (d) VVO.