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

B. H

What letter completes the series: z, x, v, t, ?

C. Q

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

A. S

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

C. H

What letter should replace the question mark in the series: b, d, f, h, ?

A. J