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

What letter should come next in the series: a, c, e, g, ?

B. H

Find the missing letter in the series: a, e, i, o, ?

A. U

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

C. Q