In a coded relation, if A × B means A is the sister of B, A + B means A is the mother of B, and A ÷ B means A is the brother of B, what is the relation of C if A × B + C?

A. C IS A'S DAUGHTER

If M × N means M is the mother of N, N - O means N is the sister of O, and O + P means O is the brother of P, what is the relationship of M to P in the expression M × N - O + P?

A. M IS THE GRANDMOTHER OF P

If M - N means M is the wife of N, M + N means M is the husband of N, and M × N means M is the brother of N, what is the relation of O if M - N × O?

B. O IS M'S SON

In a class of 30 students, A is ranked 10th from the top. What is A's rank from the bottom?

B. 20TH

In the coded relation A ÷ B means A is the son of B, B + C means B is the sister of C, and C - D means C is the mother of D. What is the relationship of A to D in the expression A ÷ B + C - D?

D. A IS THE NEPHEW OF D