Which Statement Regarding A $\sigma$ Bond Between Two Carbon Atoms Linked by a Single Bond

Which statement regarding a $\sigma$ bond between two carbon atoms linked by a single bond is FALSE?

A) The region of electron density lies along the bond axis connecting the nuclei of the two atoms.
B) The bond can be described by the overlap of sp hybrid orbitals from each atom.
C) The bond can be described by the overlap of sp2 hybrid orbitals from each atom.
D) The bond can be described by the overlap of sp3d hybrid orbitals from each atom.
E) The bond can be described by the overlap of an sp2 hybrid orbital from one atom with an sp3 hybrid orbital from the other atom.