Which of the following substances is NOT a flammable liquid?

The correct answer is salt, as it is not a flammable liquid. Flammable liquids are substances that can ignite and burn easily when exposed to an open flame or heat source. Both paint and oil consist of compounds that can catch fire and sustain combustion. They often contain volatile organic compounds (VOCs) that contribute to their flammability. In contrast, salt is a solid crystalline compound made primarily of sodium chloride, which does not possess the properties necessary for combustion or flammability. Therefore, it does not ignite or burn like the other substances listed.