While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.

A.A 20-foot sailing vessel
B.A 26-foot tug and tow
C.An uninspected 35-foot passenger vessel
D.A Navy Destroyer

A.Petroleum and fuel oil
B.Sludge
C.Oil mixed with dredge spoil
D.Oil refuse and oil mixed with wastes

A.Washing the tank interior with sea water
B.Application of degreasing solvents
C.Removal of corrosion products and sludge
D.Fresh air ventilation