L is the daughter of K. L is married to D. B is the son of D. F is married to B. How is D related to F?
L is the daughter of K. L is married to D, => D is the husband of L.
B is the son of D and F is married to B, => B is the son of D and L and F is the wife of B.
Thus, D is the father-in-law of F.
=> Ans - (A)
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