Final answer:
The interior liners of refrigerators and freezers are generally made of plastic due to its insulating properties, and cost-effectiveness.
Step-by-step explanation:
The interior liner of most refrigerator and freezer cabinets is typically made of Plastic (D). Unlike materials such as glass, wood, or stainless steel, plastic has the advantage of being lightweight, cost-effective, and a good insulator, which helps maintain the cold temperature inside refrigerators and freezers efficiently. In the evolution from the 19th-century icebox, which used actual ice to keep food cold, modern refrigerators have leveraged advancements in materials and technology to improve performance and convenience.