Which of the following is a method of extinguishing a fire?

Breaking the chain reaction is a fundamental method of extinguishing a fire. Fires need a continuous chain reaction to sustain themselves, which typically involves the combination of heat, fuel, and oxygen, commonly referred to as the fire triangle. By disrupting this chain reaction, you can effectively stop the fire from continuing to burn. This can be accomplished through various means, such as using fire extinguishing agents that interrupt the chemical processes occurring during combustion.

On the other hand, maintaining the fire triangle, increasing the amount of self-oxidizing materials, or helping the chain reaction would either contribute to a fire’s persistence or not create a suitable means for extinguishing it. Each of these actions would support the conditions necessary for a fire to ignite and continue burning, which is the opposite of extinguishment.