Which of the following constitutes a flammable liquid category?

A flammable liquid is defined as any liquid that has a flash point of 100 degrees Fahrenheit (37.8 degrees Celsius) or lower. Alcohol fits this definition as it typically has a low flash point. For example, ethanol (a common form of alcohol) has a flash point of approximately 55 degrees Fahrenheit (12.8 degrees Celsius), making it highly flammable. Thus, alcohol is classified as a flammable liquid.

In contrast, water is not classified as a flammable liquid because it does not burn and has a flash point of 212 degrees Fahrenheit (100 degrees Celsius) at standard atmospheric pressure. Ethylene glycol, commonly used in antifreeze, has a flash point around 230 degrees Fahrenheit (110 degrees Celsius), placing it in a different category as a non-flammable liquid by typical standards. Mineral oil, which has a higher flash point, generally falls into the combustible liquid category rather than flammable. Therefore, alcohol is the only choice that constitutes a flammable liquid.