Mark the incorrect option .

Options

A. Carbon:% weight in earth's crust `lt` % weight in human body
B. Magnesium :% weight in earth's crust `gt` % weight in human body
C. Sulphur :% weight in earth's crust `gt` % weight in human body
D. Sodium : % weight in earth's crust ` gt` % weight in human body

Answer

To solve the question of identifying the incorrect option regarding the percentage weight of elements in the Earth's crust compared to the human body, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze Option 1: Carbon**
- Percentage weight of Carbon in Earth's crust: **0.032%**
- Percentage weight of Carbon in the human body: **18.5%**
- Conclusion: The statement is correct because the percentage weight of Carbon is indeed less in the Earth's crust compared to the human body.

2. **Analyze Option 2: Magnesium**
- Percentage weight of Magnesium in Earth's crust: **2.1%**
- Percentage weight of Magnesium in the human body: **less than 1%**
- Conclusion: This statement is also correct because the percentage weight of Magnesium is more in the Earth's crust than in the human body.

3. **Analyze Option 3: Sulphur**
- Percentage weight of Sulphur in Earth's crust: **0.0396%**
- Percentage weight of Sulphur in the human body: **0.3%**
- Conclusion: This statement is correct as well, since the percentage weight of Sulphur in the Earth's crust is less than that in the human body.

4. **Analyze Option 4: Sodium**
- Percentage weight of Sodium in Earth's crust: **0.0033%**
- Percentage weight of Sodium in the human body: **0.2%**
- Conclusion: This statement is incorrect because the percentage weight of Sodium in the Earth's crust is less than that in the human body.

### Final Conclusion:
The incorrect option is **Option 4: Sodium**, as the percentage weight of Sodium in the Earth's crust is less than that in the human body.