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

C. Q

What letter should replace the question mark in the series: z, x, v, t, ?

C. Q

What letter should replace the question mark in the series: A, E, I, M, ?

A. O

What letter should come next in the series: a, c, e, g, ?

B. H

Find the missing letter in the series: b, d, f, h, ?

A. J