A kitchen refrigerator is left open in the middle of a small, closed room for several hours while its compressor continues to run. Which of the following best predicts and explains the long-term temperature change of the room?
(a) The room becomes slightly cooler because the refrigerator’s coefficient of performance is greater than 1, so it removes more heat from the air than it adds electrically.
(b) The room becomes slightly warmer because the refrigerator’s motor releases more thermal energy to the room than it removes from the air inside the compartment.
(c) The room’s temperature remains unchanged because any heat released by the motor is exactly balanced by the cold air leaving the compartment.
(d) The room becomes cooler because cold air continually flows out of the refrigerator, lowering the room’s temperature over time.