1.B5D means B is the father of D.
2.B9D means B is the sister of D.
3.B4D means B is the brother of D.
4.B3D means B is the wife of D.
Which of the following means F is the mother of K?
Answer: A
F3M → F is the wife of M
M5K → M is the father of K
Therefore, F is the mother of K.