|A) the floor and carpet are at different temperatures||B) the stone conveys the heat away from the feet more rapidly than the carpet|
|C) the carpet is a better conductor of heat than the stone||D) the human body maintains a constant temperature|
Both the floor and the carpet have the same temperature as both are exposed to the same atmosphere. But the former conducts away the heat from the feet better than the carpet as the latter is a non-conductor. So the feet losing more heat, the floor appears cooler to the feet.