If M is the daughter of N and N is the sister of O, what is M's relation to O?

A. NIECE

If P is the son of Q and Q is the brother of R, what is P's relation to R?

B. NEPHEW

What letter should come next in the series: A, C, E, G, I, ?

B. J

What is the next letter in the series: A, E, I, M, ?

A. O

What is the 15th letter of the English alphabet?

A. O