Adding salt to a liquid decreases the melting point of that liquid, and salt is sodium chloride or NaCl. Given these facts, adding what decreases the metling point of a liquid among the following options:
- gold
 - Heat energy
 - helium
 - fossil fuels
 - Sodium chloride
 - Calcium carbonate
 - dihydrogen monoxide
 - salinity


 

     Sodium chloride    