What is the next letter in the series: A, E, I, M, ?

A. O

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

A. I

Complete the series: x, u, r, o, ?

A. L

Find the odd one out in the series: A, C, E, G, I, K, M, O, Q, R

D. R

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

C. Q