What letter should replace the question mark in the series: b, d, f, h, ?

A. J

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

A. I

Find the missing letter in the series: b, d, f, h, ?

A. J

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

A. I

Find the missing letter in the series: b, d, f, h, ?

A. J