If M × N means M is the father of N, and N + O means N is the sister of O, what is the relationship between M and O?

B. UNCLE

If A is the sister of B and B is the mother of C, what is A's relation to C?

A. AUNT

If X is the father of Y and Y is the brother of Z, what is Z's relation to X?

C. CHILD

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

A. NIECE

In a coded relation, if M + N means M is the brother of N, M - N means M is the sister of N, and M × N means M is the father of N, what is the relationship of O if M × N - O?

A. O IS M'S DAUGHTER