Which One of the Following Statements About Carbon Is CORRECT

Which one of the following statements about carbon is CORRECT?

A) Each of carbon's three valence electrons shares a bond with another atom.
B) Carbon-carbon single bonds allow for free rotation around the bond; carbon-carbon double bonds do not allow for free rotation around the bond.
C) The spatial orientation of carbon's bonds results in a carbon atom resting in the center of a three-dimensional structure referred to as a hexahedron.
D) Carbon is not only the most abundant element on Earth, but it is believed to be the most abundant element in the universe.
E) Single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.