B does not have a sister. A is the sister-in-law of B. D is the only brother of B, while B is unmarried. F is the father-in-law of D. K is the wife of F. How is K related to A?
According to the problem, the family tree is
A is the sister-in-law of B, so A is either sister of B's husband or A should be the wife of B's brother. Since B is unmarried, A should be the wife of B's brother D.
$$\therefore\ $$K is the mother of A
Hence, the correct answer is Option B
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