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

C. DAUGHTER-IN-LAW

If A + B means A is the brother of B, A - B means A is the sister of B, and A × B means A is the father of B, what is the relationship of C if A + C - B means A is the brother of C and C is the sister of B?

A. C IS A'S SISTER

If S is the uncle of T, and T is the daughter of U, how is S related to U?

B. BROTHER-IN-LAW

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

D is the daughter of E. F is the brother of E. How is F related to D?

A. UNCLE