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 NOT correct?

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.