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

B. H

Complete the series: a, e, i, o, ?

A. U

Identify the missing letters in the series: a, d, g, j, ?

A. M

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

B. H

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

B. H