What type of materials are included in flammable and combustible liquids?

Flammable and combustible liquids are materials that can easily ignite and pose a risk of fire or explosion. Oils and gasoline are prime examples of such substances. Gasoline is a highly volatile liquid that ignites readily at temperatures as low as 45 degrees Fahrenheit, while oils, depending on their type and properties, can also present significant fire hazards when exposed to heat or open flames.

In contrast, the other options do not fall into the same category of flammability. Water-based paints usually have lower flammability as they are primarily composed of water, which reduces the risk of ignition. Dry cleaning products might contain solvents but are often not categorized as standard flammable liquids compared to gasoline and oils. Humidity-absorbing agents, like silica gel, are not combustible and are used primarily for moisture control, reinforcing their non-flammable nature. Thus, oils and gasoline are correctly identified as flammable and combustible liquids.