0n a vesel proceeding from a very cold to a warm climate with a cargo of a nonhygroscopic nature in the holds, which is true?（）.

A.Danger of heavy ship sweat exists; constant and vigorous ventilation is required
B.There is danger of heavy cargo sweat if outside air is introduced by ventilation
C.There is little danger of ships sweat, slight possibility of cargo sweat; moderate ventilation is needed
D.The po sibility of any sweat problem, either cargo or ship, is frame