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

Fact 2: Solutes decrease the freezing point or the point of crystallization of water.

Given the two facts above, answer the question "What is one way to lower the freezing point of water?" with the following options: 
- add a solute
 - purify it
 - Solutions
 - remove impurities
 - Calcium carbonate
 - add water
 - evaporation
 - Dehydration


 

 add a solute        