Find the odd one out in the series: A, C, E, G, H, I, K.

C. H

A, E, I, M, ?

A. O

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

D. U

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

A. S

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

A. I