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

B. H

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

A. J

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

C. Q

Identify the missing letters in the series: a, e, i, o, ?

A. U

What letter comes next in the series: d, g, j, m, ?

A. P