In this scenario, since the cheese, the dish, and the air in the refrigerator are all at the same temperature of 3.0 Celsius, there is no temperature difference between them. Heat transfer occurs only when there is a temperature difference; heat flows from a warmer object to a cooler one.
Therefore, the correct statement is: Heat will not flow because there is no temperature difference between the substances.
The other statements imply a flow of heat, which wouldn't occur due to the equal temperatures.