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

D. I

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

B. S

What is the next letter in the series: A, C, E, G, ?

A. I

What is the next letter in the series: A, C, E, G, ?

A. I

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

A. J