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

If S is the mother of T and T is the daughter of U, what is U's relation to S?

A. HUSBAND

Identify the missing letter in the series: Z, X, V, T, ?

A. R

Find the odd one out in the series: A, D, G, J, M, P, S, ?

B. U