The correct answer is C) Containers should be ventilated, dehumidified, or the contents physically protected against sweat damage. This is correct because sweat damage can occur in any type of container, not just those carrying hygroscopic cargoes. The small enclosed volume of air in containers can lead to the accumulation of moisture, which can condense on the container walls and damage the cargo. To prevent this, proper ventilation, dehumidification, or physical protection of the cargo is required. The other options are incorrect. Option A is too narrow, as sweat damage is not limited to just hygroscopic cargoes. Option B is false, as the small enclosed volume can actually increase the risk of sweat damage. Option D is also incorrect, as sweat damage is a concern in all types of containers, not just insulated or refrigerated ones.