What is the substance called which can readily be converted from a liquid into a vapor, an

What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure？

A.Refrigerator

B.Refrigerant

C.Cooling medium

D.Brine

请帮忙给出正确答案和分析，谢谢！