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

B. H

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

A. R

What letter should come next in the series: b, d, f, h, ?

C. I

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

B. T

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

C. H