Identify the missing letter: x, u, r, o, ?

A. L

Complete the series: z, x, v, t, ?

A. R

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

B. H

What letter should come next in the series: B, D, F, H, ?

A. J

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

A. J