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

A. J

What is the missing number in the series: 2, 4, 8, 16, ?, 64?

B. 32

Find the missing number in the series: 5, 10, 20, 40, ?

C. 80

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

A. I

Identify the missing number in the series: 12, 24, 48, ?, 192

A. 96