Identify the pattern: 1, 1, 2, 3, 5, 8, ?

D. 13

If the sequence is A, C, E, G, what is the next letter?

B. H

In the series 2, 4, 8, 16, what is the next number?

C. 32

What comes next in the pattern: X, Y, Z, A, B, ?

A. C

What comes next in the series: A1, B2, C3, D4, ?

A. E5