The box has been used to keep the food hot has been a bad conductor of heat. The heat has been entrapped within the box that helps for the food to keep hot.
The material used for the box to keep the food hot has been rubber. Thus, option C is correct.
The conductor is the materials that has been able to transfer the energy. The insulators are the materials that do not allow the transfer of energy.
The metals have been considered as good conductor of energy. Thus, with the use of stainless steel, aluminum foil, or even glass results in the transfer of energy from food to the environment resulting in cooling the food.
The rubber has been a bad conductor of energy and is a good insulator. It has been able to entrap the heat energy in the box and keeps the food hot. Thus, option C is correct.
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