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

A. AUNT

If J - K means J is the daughter of K, and K + L means K is the brother of L, what is the relationship of J to L?

C. NIECE

If J is the son of K and K is the sister of L, what is the relationship of J to L?

A. NEPHEW

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

A. SON