You are presented with the question "What decreases the melting point of liquid?" and the following answer choices: 
- Dilution
 - Impurities
 - Water expanding
 - Dehydration
 - Heat energy
 - Pollution
 - Time and energy
 - evaporation

Now knowing that adding salt to a liquid decreases the melting point of that liquid and impurities like salts would also help by lowering the melting point, choose the best answer.


 

  Impurities       