R is sister of M who is brother of H. D is mother of K who is brother of M. How is R related to D?
R,M,H and K are siblings, where R is female and M and K are males.
Gender of H is unknown. D is mother of K.
=> D is mother of R,M,H and K.
$$\therefore$$ R is the daughter of D.
=> Ans - (B)
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