When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold, you should __________.

Correct Answer: Option C — ventilate the cargo holds

Ventilating cargo holds is required when the outside air dew point is lower than or equal to the internal dew point. This practice removes moisture-laden air, preventing cargo sweat and maintaining safe atmospheric conditions for hygroscopic and general cargoes.