What letter comes next in the series: M, O, Q, S, ?

B. T

Find the incorrect letter in the series: A, D, G, J, M, P, S

D. J

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

B. H

Identify the missing letters in the series: b, d, f, h, ?

A. J

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

C. Q