Complete the series: B, D, F, H, ?

C. I

Identify the missing letters in the series: b, d, f, h, ?

A. J

Identify the missing letter in the series: Z, X, V, T, ?

B. S

Complete the series: m, n, o, p, ?, r

A. Q

Complete the series: B, D, F, H, ?

A. J