Which of the Following Best Describes the Molecules of a Sample

Multiple Choice

Which of the following best describes the molecules of a sample of ethane gas at room temperature?

A) Almost all of the molecules are frozen or locked in the eclipsed conformation.
B) Almost all of the molecules are frozen or locked in the staggered conformation.
C) The molecules are rapidly interconverting between the eclipsed and staggered conformations, but at any one time slightly more of them are present in the eclipsed conformation.
D) The molecules are rapidly interconverting between the eclipsed and staggered conformations, but at any one time slightly more of them are present in the staggered conformation.