You are on a containership. Which statement about the stowage of hazardous materials in containers is TRUE?（）.

A.The containers provide automatic segregation of hazardous materials except for class A explosives
B.All packages within a container must be marked This End Up to indicate the correct stowage
C.A refrigerated container with a fuel tank containing a flammable liquid must be stowed on deck
D.Packages of liquids within a container should be stowed on top of packages of solids to prevent crushing