A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
N, P, ?, U, X, Z, C, E, H

Given: N, P, ?, U, X, Z, C, E, H

Logic: Letters are increasing + 2 and + 3 place alternately.

N + 2 = P

P + 3 = S

S + 2 = U

U + 3 = X

X + 2 = Z

Z + 3 = C

C + 2 = E

E + 3 = H

So, the missing term is S.

Thus, correct option is (b).