Read the following context and choose the best option to answer the question.
Context: It has been miserably cold , and raining as well . It was so cold in the kitchen that we had the novel experience of opening the frig door and having warm air come out . When we have our evening glass of champagne the glasses are colder than the liquid , so you get half an inch in the bottom of the glass and the rest is froth .
Question: What is the reason that warm air comes out of the refrigerator ?
Options: 
A. The manual reversing vacuum valve is on in the refrigerator .
B. The temperature near the refrigerator is VERY hot .
C. None of the above choices .
D. There is boiling water inside the refrigerator , kept there overnight .


C