Ammonia is the refrigerant and water is absorbent

• In ammonia water vapour absorption refrigerator system ammonia is used as refrigerant and water is used as absorbed.
• Water has strong affinity for ammonia and they are soluble with each other.
• The ammonia water solution is highly stable and works well with many materials except copper and its alloys.
• The working of ammonia water absorption refrigeration system is based on the simple vapour absorption refrigeration system.
• In this system ammonia is used as refrigerant and water is used as the absorbent.
• The ammonia water absorption system is used in the domestic as well as commercial application.

Hence, the correct option is (B).