Question: Propane (C_{3}H_{8}) is a gas at room temperature. Which statement best describes the physical characteristics of a sample of propane at room temperature?

  Options: 
 A. It has a definite volume and takes the shape of its container.
 B. It has an indefinite volume and takes the shape of its container.
 C. It has a definite volume, and its shape is independent of its container.
 D. It has an indefinite volume, and its shape is independent of its container. 
Answer: B