A flammable liquid having a Reid vapor pressure of 8½ P.S.I.A. or less and a flash point of 80°F or below is grade __________.

Correct Answer: Option C — C

Under 46 CFR 30.10-22, Grade C flammable liquids are defined as those having a Reid vapor pressure of 8.5 psia or less and a flash point of 80°F or below. This classification is critical for determining proper tank venting, fire suppression requirements, and cargo handling safety protocols on tankers.