Using the available references, if the dry bulb temperature is 80°F (27°C) and the wet bulb temperature is 70°F (21°C), what is the relative humidity in a cargo hold?

Correct Answer: Option C — 61%

Consulting standard psychrometric tables with an 80°F dry bulb and 70°F wet bulb temperature provides a relative humidity of 61%, ensuring officers can accurately assess atmospheric moisture levels and protect cargo from condensation risks.