Complete the series: B, D, F, H, ?

D. I

A, C, E, G, ?

B. H

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

B. H

Find the missing term in the series: 1, 1, 2, 3, 5, ?, 21.

A. 8

What letter comes next in the series: d, g, j, m, ?

A. P