What is the best method for extinguishing a fire of escaping liquefied flammable gas?

Correct Answer: Option A — stopping the flow of gas

Extinguishing a fire involving escaping liquefied gas is best achieved by stopping the flow of fuel. Attempting to extinguish the flame while the gas continues to leak creates a high risk of a vapor cloud explosion. Shutting off the supply removes the fuel source, effectively extinguishing the fire.