Which of the following options is NOT a safe method for handling partially burned papers?

Leaving partially burned papers on a countertop is not a safe method for handling them because this can lead to accidental ignition. Countertops provide a flat surface, but they are often surrounded by flammable materials, such as paper towels, food packaging, and other combustible items. In addition, without proper containment, embers or sparks from the partially burned papers may escape and ignite nearby items.

In contrast, keeping them in a sealed container helps to confine any potential embers, reducing the risk of fire. Placing them in a furnace, stove, or fireplace is controlled combustion, which is designed to manage the heat and fire safely. Disposing of them in a fire pit can also be an acceptable method, as long as the fire pit is designed for controlled burning and is supervised. Thus, leaving partially burned papers on a countertop significantly increases the risk of fire hazards.