Which of the following expression indicates 'R is the sister of H'?

Explanation Option (c) is correct. R is the sister of H, means R is the daughter of F and D. Therefore first eliminate those options which show the relationship of F or D with R, other than that of a father (@) or mother (); or conversely R with F or D, other than that of a daughter (%). Option A and D can be eliminated by this check. In option B and C all the relationship appear logical. However in option B it is not possible to determine whether R is male or female as R is shown as daughter of D and F. Option C therefore correctly establishes R as the sister of H. Hence the answer is (C) R % D @ F  H.