In the series A, B, C, D, E, F, G, how many letters are there before the letter D?

B. 3

If Z is the 26th letter, what is the 15th letter of the alphabet?

A. O

In the sequence A, B, C, D, E, F, which letter is in the 3rd position?

A. C

In the series A, B, C, D, E, F, G, how many times does the letter 'C' appear?

A. 1

What is the 15th letter of the English alphabet?

A. O