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

A. J

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

B. T

What is the next letter in the series: A, C, E, G, ?

A. I

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

B. H

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

B. H