A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
NZ, PB, RE, TI, VN, XT, ?, BI

Given: NZ, PB, RE, TI, VN, XT, ?, BI

Logic: 1st letter + 2 and 2nd letter increasing natural number from 2.

For, 1st letter

N + 2 = P, P + 2 = R, R + 2 = T, T + 2 = V, V + 2 = X, X + 2 = Z, Z + 2 = B

For, 2nd letter

Z + 2 = B, B + 3 = E, E + 4 = I, I + 5 = N, N + 6 = T, T + 7 = A, A + 8 = I

So, the missing term is ZA.

Thus, correct option is (d).