The property of the material that is most likely used to decide which material to put on a slick road is A) solubility.
This is because the effectiveness of materials like calcium chloride and sodium chloride as de-icing agents is largely dependent on their solubility in water. The more soluble the material is, the better it can dissolve and create a brine solution that helps to lower the freezing point of water, thus melting the ice and snow more effectively.