120.0 liters of a gas are prepared at a pressure of 300.0 mm Hg and a temperature of 100.0 °C. The gas is placed into a tank under high pressure. When the tank cools to 30.0 °C, the pressure of the gas is 30.0 mm Hg. What is the volume of the gas?

A.674.8 L
B.774.8 L
C.874.8 L
D.974.8 L