What character should replace the question mark in the pattern: X, Y, Z, A, B, ?

A. C

In the sequence A, B, C, D, ?, F, what character should replace the question mark?

A. E

What character should replace the question mark in the sequence: A, B, C, ?, E?

A. D

In a series of numbers: 2, 4, 8, 16, ?, 64. What is the missing number?

B. 32

If the pattern is 1, 2, 4, ?, 16, what number should replace the question mark?

A. 8