Inside a House,stepping on a Tile Floor Barefooted May Feel

Multiple Choice

Inside a house,stepping on a tile floor barefooted may feel almost cold,but stepping on carpet in an adjacent room feels comfortably warm.Why is this?

A) It's because the tile is below room temperature while the carpet is at room temperature.
B) It's because the tile is at room temperature while carpet is normally warmer.
C) It's because the thermal conductivity of tile is less than that of carpet.
D) It's because the thermal conductivity of carpet is less than that of tile.