Which of the following is an example of a flammable material?

Kerosene is classified as a flammable material because it has a relatively low flash point, which means it can easily ignite when exposed to an open flame or spark. It is a liquid hydrocarbon fuel that burns readily in the presence of oxygen, and its properties make it suitable for use in various applications, such as heating and cooking.

In contrast, water, sand, and ice are not flammable materials. Water is a non-combustible substance that can actually extinguish fires by cooling and depriving flames of oxygen. Sand is an inert material used to smother fires and is often employed as a fire suppression method. Ice, being frozen water, similarly does not support combustion and, like water, can help to quench a fire when it melts. Thus, kerosene stands out as the correct answer due to its inherent flammability.