• The tank on the liquid line between the condenser and the thermal expansion valve is a liquid receiver.
• The function of a receiver is to store liquid refrigerant to provide a continuous flow of refrigerant to the expansion device and to provide storage for the refrigerant charge.
• The Liquid Receiver ensures that the liquid refrigerant is entering the expansion device to make sure that it is cooling the refrigerator efficiently.

Hence, the correct option is (D).