Fact 1: Adding salt to a solid decreases the freezing point of that solid.

Fact 2: Freezing point depression is a colligative property.

Given the two facts above, answer the question "what effects the colligative properties of solids" with the following options: 
- salts
 - seasons
 - solutes
 - size
 - a prism
 - forces
 - fields
 - Alcohol


 

 salts        