In the process of cooling air inside the refrigerator, the refrigerant freezes cools vaporizes melts

The correct answer is "Vaporizes".

Explanation:

Vaporization is the phenomenon in which the liquid changes to gas.

Refrigerant comes into the compressor. It keeps an item below room temperature to store the item or to cool or freeze that item.

Refrigerator use a refrigerant chemical to remove heat from the items stored inside system. Refrigerant circulates inside the refrigerator to change a liquid into gas.

Therefore, in the  process of cooling air inside the refrigerator, the refrigerant vaporizes.

b would be the answer

i believe it is b. what was the cause of the big bang

hope this !