B is the mother of U. U is the sister of N. C is the father of Y. Y is the husband of N. How is Y related to B?

The correct option is Daughter`s husband.

Let us break down the relations step-by-step to determine how Y is related to B:

1. B is the mother of U: This implies U is the child (son or daughter) of B.

2. U is the sister of N: Since U and N are siblings and B is the mother of U, B must also be the mother of N. Also, U is female.

3. Y is the husband of N: Since Y is married to N as her husband, N is female. Therefore, N is B's daughter.

4. Relationship between Y and B: Since N is the daughter of B and Y is the husband of N, Y is the husband of B's daughter.

Therefore, Y is B's Daughter`s husband (son-in-law).