Fact 1: Adding salt to a liquid decreases the melting point of that liquid.

Fact 2: Impurities like salts would also help by lowering the melting point.

Given the two facts above, answer the question "What decreases the melting point of liquid?" with the following options: 
- Dilution
 - Impurities
 - Water expanding
 - Dehydration
 - Heat energy
 - Pollution
 - Time and energy
 - evaporation


 

  Impurities       