Choose the incorrect statement from the following.
Forest fires are usually due to:

Options

A. carelessness of humans
B. heat of sun
C. cutting of trees
D. lightning strike

Answer

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks us to identify the incorrect statement regarding the causes of forest fires.

2. **Analyze the Options**: We need to evaluate each option provided to determine which one is incorrect. The options typically include various causes of forest fires.

3. **Consider Human Carelessness**: One common cause of forest fires is human carelessness, such as leaving campfires unattended or discarding cigarette butts. This is a valid cause.

4. **Evaluate Sun's Heat**: The sun's heat can contribute to forest fires, especially in dry conditions. However, it is not the primary cause; rather, it acts as a catalyst when combined with other factors.

5. **Assess Lightning Strikes**: Lightning strikes can indeed ignite forest fires, but they are relatively rare compared to other causes.

6. **Identify Deforestation**: The cutting down of trees (deforestation) leads to an increase in temperature and dry conditions, which can promote forest fires. This is a significant contributing factor.

7. **Determine the Incorrect Statement**: After evaluating all the options, we conclude that while all options can contribute to forest fires, the one that is least significant or incorrect in the context of usual causes is likely the one that suggests a rare occurrence (like lightning strikes) as a primary cause.

8. **Final Answer**: The incorrect statement regarding the usual causes of forest fires is likely the one that emphasizes lightning strikes as a common cause.