Using the available references, if the dry bulb temperature is 85°and the wet bulb temperature is 73°, what is the relative humidity in a cargo hold?

Correct Answer: Option B — 56%

Entering standard psychrometric tables with a dry bulb temperature of 85°F and a wet bulb temperature of 73°F yields a relative humidity of 56%, a critical calculation for managing hold ventilation and preventing condensation damage on voyages.