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

A. I

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

B. H

Complete the series: B, E, I, M, ?

A. O

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

B. H

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

C. I