MgCl₂ Crystals Are Composed of

MgCl₂ crystals are composed of

A) units of MgCl₂ molecules held together by dipole interactions.
B) groups of Mg²⁺ ions and Cl₂ molecules.
C) units composed of six Mg atoms and six Cl₂ molecules.
D) a multitude of Mg²⁺ ions and Cl^- ions grouped together in a three-dimensional array with a 1:2 ratio of Mg²⁺ to Cl^-.
E) a two-dimensional array of [-Mg-Cl-Cl-] units.