If F @ D % K # H, then how is F related to H?

Explanation Option (a) is correct. F @ D % K # H means F is the husband of D, who is the daughter of K. K is the father of H. F is the husband of D who is the sister of H. Therefore F is H?s brother-in-law. Hence, the answer is (A). (Please note here that from the relationships given, it is not clear whether H is male or female, however absence this information does not affect the relationship between H and F)