Final answer:
In an ammonia absorption refrigeration system, water is used as the solution that absorbs the ammonia refrigerant.
Thus optionA) water. is correct answer.
Step-by-step explanation:
The solution used in an ammonia absorption refrigeration system is water (A). In this type of refrigeration system, ammonia serves as the refrigerant and water acts as the absorbent.
Ammonia is a colorless gas with a sharp, pungent odor that readily liquefies, and it boils at -33 °C. It is quite soluble in water, which allows it to be effectively used in refrigeration.
Ammonia's high enthalpy of vaporization, due to intermolecular hydrogen bonding, makes it an excellent choice as a refrigerant in these systems.
Thus optionA) water. is correct answer.