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

A. J

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

A. S

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

A. J

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

B. H

Complete the series: b, d, f, h, ?

A. J