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

A. J

What is the next letter in the series: A, E, I, M, ?

A. O

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

B. H

Identify the missing letter in the series: Z, X, V, T, ?

C. Q

Find the odd one out in the series: A, C, E, G, I, K, M, O, Q, R

D. R