Your vessel is damaged，listing to port and on occasion flopping to the same angle to starboard. It has a long，slow，sluggish roll around the angle of list. There is excessive trim by the stern with little freeboard aft. What action should you take?（）.

A.Jettison any off-center topside weights to lower GM and correct the list

B.Pump out any slack after double-bottom tanks to reduce free surface and increase freeboard aft

C.Pump out the after peak and fill the forepeak to change the trim

D.Press up any slack double-bottom tanks forward of the tipping center，then fill the forepeak if empty

简述探明的内蕴经济资源量。