How Does the Ionic Compound Magnesium Chloride Form

How does the ionic compound magnesium chloride form?

A) A magnesium atom loses one electron, a chlorine atom gains one electron, and an ionic bond forms between the chloride ion and the magnesium ion.
B) A magnesium atom loses two electrons, two chlorine atoms each gain one electron, and an ionic bond forms between each chloride ion and the magnesium ion.
C) Two magnesium atoms each lose one electron, two chlorine atoms each gain one electron, and an ionic bond forms between each chloride ion and each magnesium ion.
D) A chlorine atom loses one electron, a magnesium atom gains one electron, and an ionic bond forms between the chloride ion and the magnesium ion.
E) Two chlorine atoms each lose one electron, a magnesium atom gains two electrons, and an ionic bond forms between each chloride ion and the magnesium ion.