Which source of ignition could arise from everyday activity?

Choosing fans as a source of ignition from everyday activities is based on the fact that electrical appliances like fans can overheat, especially if they're poorly maintained or not designed for continuous use. If the internal components become too hot or if there's a malfunction, this can pose a fire risk. Additionally, dust accumulation on the fan blades can ignite and contribute to the fire hazard.

Unlike fans, concrete surfaces are generally non-flammable and would not typically be a source of ignition. Tarps, depending on their material, can potentially catch fire, but they aren’t typically associated with ignition in the way that malfunctioning electrical devices are. Storage bins, on the other hand, are more about containment than ignition. Typically, they do not generate heat or produce sparks under normal conditions, which limits their potential as a source of ignition. Instead, the electrical nature of fans is more directly linked to ignition risks in typical indoor environments.