Which of the Following Statements About the Conformations of Acyclic

Which of the following statements about the conformations of acyclic alkanes is true?

A) Conformations are the same arrangements of atoms that cannot be interconverted by rotation about single bonds.
B) In the staggered conformation, the C-H bonds on one carbon are directly aligned with the C-H bonds on the adjacent carbon.
C) Rotating the atoms on one carbon by 60° converts an eclipsed conformation into a staggered conformation, and vice versa.
D) In the eclipsed conformation, the C-H bonds on one carbon bisect the H-C-H bond angle on the adjacent carbon.