Given a dry bulb temperature of 78°F and wet bulb temperature of 66.5°F, the dew point is __________.

Correct Answer: Option C — 59.0°F

Entering psychrometric tables with a dry bulb of 78°F and wet bulb of 66.5°F determines the intersection point corresponding to a dew point of 59.0°F, an essential computation for deck officers evaluating ventilation criteria to prevent moisture damage.