23. DNA double helix structure is stabilized by all of the following EXCEPT: (A) the sugar-phosphate backbones are oriented in opposite directions. (B) the glycosidic bonds holding paired bases are directly across the helix from one another. (C) cations such as Mg2+ bind to the anionic phosphates. (D) bases stack together through hydrophobic interactions and van der Waals forces. (E) appropriate base pairing builds a polymer whose external dimensions are uniform.