Why Do Salt Crystals Form in a Pan of Seawater

Why do salt crystals form in a pan of seawater from which the water has been evaporated?

A) In the absence of water,sodium and chloride form ionic bonds and aggregate into crystals.
B) In the absence of water,chloride donates electrons to sodium and the compounds aggregate into crystals.
C) In the absence of water,sodium and chloride share electrons in a stable bond that permits crystal formation.
D) In the absence of water,sodium and chloride form hydrogen bonds and aggregate into crystals.
E) In the absence of water,sodium and chloride form covalent bonds and aggregate into crystals.