In a room containing air, heat can go from one place to another

Transfer of heat due to conduction is the molecular vibrations which does not involve mass movement. In the room, heat conduction is possible due the molecular collision of air molecules and other molecules present.
Transfer of heat due to convection is due to actual movement of heated material or molecules. In the room, the movement of air molecules from one place to another can result in heat transfer.
Transfer of heat due to Radiation does not need any medium or material. So, in a room containing air energy is radiated by every body or object, thus heat transfer is possible.
Thus, option (d) is the correct option.

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