What letter should replace the question mark in the series: m, n, o, p, ?

A. Q

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

A. J

Identify the missing letter in the series: z, x, v, t, ?

A. R

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

D. I

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

B. S