4. A sample of ideal gas that initially occupies 15.0 L. at 300 K and 1.0 bar is compressed isothermally. To what volume must the gas be compressed to reduce its entropy by 5.0 J/K? (A) 5.40 L, (B) 5.56 L, (C) 8.22 L, (D) 20.6 L, (E) 40.5 L.