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

A. U

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

C. Q

Identify the missing letter in the series: Z, X, V, T, ?

D. P

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

C. Q

  - What is the next letter in the series: A, C, E, G, I, ?

B. J