B, D, F, H, ?

A. J

A, E, I, M, ?

B. O

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

D. O

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

B. H

What is the missing number in the series: 2, 6, 12, 20, ?, 42

B. 32