What is the position of the letter 'M' in the English alphabet?

B. 13

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

C. 32

Identify the odd one out: 3, 6, 9, 12, 15, 18, 20.

D. 20

Which letter comes next in the series: Z, Y, X, W?

B. U

If the sequence is 1, 1, 2, 3, 5, what is the next number?

B. 7