Which statement concerning sweat damage in containers is TRUE?（）.
- ASweat damage in containers is unusual due to the small enclosed volume of air
- BIn general，containerized hygroscopic cargoes are the only ones subject to sweat damage
- CContainers should be ventilated，dehumidified，or the contents physically protected against sweat damage
- DSweat damage is not a problem except in insulated and refrigerated container