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

B. MOTHER

If A is the brother of B, and B is the sister of C, how is A related to C?

A. BROTHER

If M is the sister of N and N is the brother of O, how is M related to O?

A. SISTER

If M is the father of N and N is the son of O, what is the relationship of O to M?

D. MOTHER

If A is the brother of B, and B is the sister of C, what is the relationship of A to C?

A. BROTHER