Which of the following is not a measure to conserve coal and petroleum?
I. Use energy efficient appliances.
II. Switch off lights, fans, TV, etc. when not needed.
III. Use personal vehicles for avoiding overcrowding.
Choose the correct option.

Options

A. I and II
B. II and III
C. Only III
D. None of the above

Answer

To determine which of the options is not a measure to conserve coal and petroleum, we need to analyze each statement provided:

1. **Use energy efficient appliances.**
- Energy-efficient appliances consume less electricity, which is often generated from coal. By using less electricity, we reduce the demand for coal, thus conserving it. This is a valid measure to conserve coal and petroleum.

2. **Switch off lights, fans, TV, etc. when not needed.**
- By switching off appliances when they are not in use, we minimize energy consumption. This leads to a reduction in the demand for electricity, which again is often produced from coal. This is also a valid measure to conserve coal and petroleum.

3. **Use personal vehicles for avoiding overcrowding.**
- Using personal vehicles means more cars on the road, which leads to increased fuel consumption. This contradicts the goal of conserving petroleum, as it promotes higher usage of fossil fuels rather than reducing it. Therefore, this option is not a measure to conserve coal and petroleum.

Based on this analysis, the correct answer is:
**III. Use personal vehicles for avoiding overcrowding.**