1. 

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?
A. F3M5K
B. F5M3K
C. F9M4N3K
D. F3M5N3K

Answer: Option A

Explanation:

F3M ? F is the wife of M

M5K ? M is the father of K

Therefore, F is the mother of K.