Correct option (D) 745 sq. units
See Fig.
Since r2 + s2 = e2, e = 31 or e = 19 is not possible. Therefore, e equal to 13, 20 or 25.
The possibilities for triplet {r, s, e} are {5, 12, 13}, {12, 16, 20}, {15, 20, 25}, {7, 24, 25}.
Since 16, 15 and 24 do not appear among any of pair wise differences of 13, 19, 20, 25, 31, we have a = 19, b = 25, c = 31, d = 20, e = 13.
Hence required area = 745 sq. units.