Holes in the bulwark，which allow deck water to drain into the sea，are（）.

A.displacement in metric tons
B.total weight including cargo
C.volume in cubic feet
D.the volume of the enclosed space

A.parallel to the longitudinal direction of the chain
B.perpendicular to the direction of the anchor chain
C.diagonally across the link of the anchor chain
D.around the circumference of the chain link

A.oil from flowing out of the tank vent
B.air from entering the tank vent
C.vapors from leaving the tank vent
D.flames on deck from entering the tank vent