Which of these fire extinguishing methods can be used to put out an oil fire?

Options

A. Pour water on the fire
B. Use a soda-acid free extinguisher
C. Use a carbon dioxide fire extinguisher
D. All of these

Answer

To determine which fire extinguishing method can be used to put out an oil fire, let's analyze the options provided step by step.

### Step 1: Evaluate the first option - Pouring water on the fire.
- **Explanation**: Water is heavier than oil. When poured on an oil fire, the water will settle at the bottom, and the oil will float on top. The fire will continue to burn above the water, making this method ineffective.
- **Conclusion**: This option is **not suitable** for extinguishing an oil fire.

### Step 2: Evaluate the second option - Using a soda acid fire extinguisher.
- **Explanation**: A soda acid fire extinguisher typically contains sodium bicarbonate and sulfuric acid. When mixed, they produce carbon dioxide and water. While carbon dioxide can help extinguish the fire by cutting off the oxygen supply, the water produced can actually support the fire, as it does not effectively remove the oil from the equation.
- **Conclusion**: This option is also **not suitable** for extinguishing an oil fire.

### Step 3: Evaluate the third option - Using a carbon dioxide fire extinguisher.
- **Explanation**: A carbon dioxide fire extinguisher releases carbon dioxide gas, which can effectively smother the fire. It works by displacing oxygen around the fire, thus cutting off the oxygen supply that the fire needs to continue burning. This method is effective for oil fires.
- **Conclusion**: This option is **suitable** for extinguishing an oil fire.

### Step 4: Evaluate the fourth option - (Assuming a hypothetical option).
- **Explanation**: Without a specific fourth option provided, we cannot evaluate it. However, if it were another method that involves water or similar substances, it would likely be ineffective.
- **Conclusion**: Without further information, we cannot determine the effectiveness of this option.

### Final Answer:
The method that can be used to put out an oil fire is **using a carbon dioxide fire extinguisher**.

---