21. Which one of the following statements is correct? (A) The value of S° for N2O at 0 K is greater than that for He at 10 K. (B) At 1 atm and 25°C, the value of S° for He(g) is greater than that for N2O(g). (C) The sign of S° for the reaction of 2H2S(g) + SO2(g) → 3Srhombic(s) + 2H2O(g) is negative. (D) The sign of S° for the reaction of 2SO3(g) → 2SO2(g) + O2(g) is negative. (E) The sign of S° for the reaction of Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(g) is only positive.