Financial Mathematics question, please use formulas and handwritten work rather than excel (picture provided). Will rate kindly.

An estate provides a perpetuity with payments of X at the end of each year. Seth, Susan, and Lori share the perpetuity such that Seth receives the payments of X for the first n years and Susan receives the payments of X for the next m years, after which Lori receives all the remaining payments of X. Which of the following represents the difference between the present value of Seth's and Susan's payments using a constant rate of interest? (C) X[a-vam] (A) X[an-vam] (B) X[&, -v"&m] (D) X[a-v] (E) X [va, -vam]