According to Coast Guard Regulations (46 CFR), a flammable liquid with a Reid vapor pressure of 8 1/2 psi or less, and a flash point of 80°F or below, is a grade __________.

Correct Answer: Option C — C

Per 46 CFR Table 30.25-1, Grade C liquids are defined as those having a Reid vapor pressure of 8.5 psi or less and a flash point of 80°F or below. This classification system is vital for determining proper stowage, handling, and fire protection requirements for hazardous materials carried on vessels.