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

B. H

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

A. U

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

B. H

Complete the series: m, n, o, p, ?

A. Q

What letter should replace the question mark in the series: a, e, i, o, ?

A. U