What is an advantage of using foam in fire fighting?（）

A. It is effective in controlling fire in flowing oil such as coming from a broken fuel line
B. It absorbs heat from materials that could cause reignition
C. Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment
D. Once the surface is blanketed with foam and the fire is extinguished，no further foam is required