Using the available references, if the dry bulb temperature is 77° and the wet bulb temperature is 69°, what is the relative humidity in a cargo hold?

Correct Answer: Option A — 67%

Applying standard psychrometric tables with a dry bulb of 77°F and a wet bulb of 69°F yields an 8-degree depression. This intersection corresponds to a relative humidity of 67% within the ventilated cargo space.