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

A. J

Complete the series: a, c, e, g, ?

B. H

Complete the series: a, c, e, g, ?

B. H

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

A. L

What letter comes next in the series: z, x, v, t, ?

C. Q