A deck-stowed 40-foot container is giving off smoke，and one end is discolored from heat. The cargo is valuable and easily damaged by water. You want to extinguish the fire without further damage if possible. What action should you take? ______.
A.Connect a portable line from the ship's fixed system and discharge CO2 into the container
B.Flood the container with water and disregard any cargo damage as the fire threatens the entire vessel
C.Pierce the container and discharge 6 or more portable CO2's then add more CO2 hourly
D.Cool the exterior of the container with water and close all vents； then keep it cooled until it can be off-loaded