A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

A.soild materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solids

A.water
B.foam
C.the range hood extinguishing system
D.fire dampers

A.punt used for painting over the side
B.small, reciprocating steam engine
C.spool-shaped drum fitted on a winch
D.swinging derrick