🔍 Key Concepts

• Flammable-liquid grades (A, B, C, etc.) as used in marine/hazardous cargo classifications • Typical flash point and boiling point ranges for Grade B flammable liquids • The difference between highly volatile/very low flash point liquids vs. less volatile flammable liquids

💭 Think About

• Compare which of the listed chemicals is known to be most volatile and ignites at the lowest temperatures • Think about which substances are often treated as especially dangerous cargoes due to very low flash point and high vapor production • Ask yourself which option is more likely to behave like a very light, fast-evaporating solvent rather than an oily or heavier liquid

✅ Before You Answer

• Verify which chemical has the lowest flash point and boiling point among the options • Confirm which substance is commonly classified in regulations as a high-hazard flammable liquid (Grade B or equivalent) • Check whether the substance is known to produce large amounts of flammable vapor at normal ambient temperatures