Shifting weight aft in heavy weather will reduce the tendency to yaw，but may increase the tendency to（）.

A.unoccupied space below the waterline
B.volume of intact space above the waterline
C.excess of the buoyant force over the gravity force
D.difference in the buoyant force in salt and fresh waters

A.also called GM
B.the void portion of the ship below the waterline which is enclosed and watertight
C.affected by the number of transverse watertight bulkheads
D.the watertight portion of a vessel above the waterline

A.roll period
B.metacentric height
C.waterplane area
D.vessel's draft