The diagram illustrates the interior of a refrigerator. As soon as the refrigerator is turned on, what happens to the air close to the cooling unit?
- Athe molecules of this air become smaller; the density of this air decreases
- Bthe molecules of this air become smaller; the density of this air increases
- Cthe molecules of this air move closer together; the density of this air decreases
- Dthe molecules of this air move closer together; the density of this air increases