Which statement about carbon is correct? choose the correct answer from the following choices, and then select the submit answer button.
a. 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.
b. carbon is not only the most abundant element on earth; it is believed to be the most abundant element in the universe.
c. each of carbon's three valence electrons shares a bond with another atom.
d. carbon-carbon single bonds allow for free rotation around the bond; carbon-carbon double bonds do not allow for free rotation around the bond.
e. single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.