In the code, if P - Q means P is the father of Q, P + Q means P is the son of Q, and P ÷ Q means P is the sister of Q, what is the relation of R if P - Q ÷ R?

C. R IS P'S SISTER

K is the son of L. M is the sister of L. How is K related to M?

D. NEPHEW

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

B. HUSBAND

In a coded relationship, if A + B means A is the father of B, A - B means A is the daughter of B, and A × B means A is the son of B, what is the relationship of C if A + C - B?

D. C IS THE SISTER OF B

In the expression X + Y × Z - W, if X is the father of Y, Y is the brother of Z, and W is the sister of Y, what is the relationship of W to X?

A. W IS THE DAUGHTER OF X