If D is the daughter of E and E is the sister of F, what is the relationship of D to F?

A. NIECE

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

B. SON

If D is the daughter of E and F is the son of E, what is F to D?

A. BROTHER

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 + B × C?

D. C IS A'S SON

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

A. SON