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

A. J

Complete the series: x, u, r, o, ?

A. L

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

A. J

What letter comes next in the series: z, x, v, t, ?

C. Q

Complete the series: m, o, q, s, ?

A. T