To solve the question "Which one of the following is a source of energy but does not cause pollution?", we can follow these steps:
### Step 1: Analyze the Options
We have four options (A, B, C, D) to evaluate. We need to determine if each option is a source of energy and whether it causes pollution.
### Step 2: Evaluate Option A - Gasoline
- **Gasoline** is a fossil fuel used for energy (in vehicles, for example).
- **Pollution Check**: Gasoline combustion releases carbon dioxide (CO2), nitrogen oxides (NOx), and other pollutants into the atmosphere.
- **Conclusion**: Gasoline causes pollution, so it is not the correct answer.
### Step 3: Evaluate Option B - Nuclear Power
- **Nuclear Power** is generated through nuclear reactions, primarily fission.
- **Pollution Check**: While it does not produce air pollutants like fossil fuels, it generates radioactive waste, which is a significant environmental concern.
- **Conclusion**: Nuclear power does cause pollution (radioactive), so it is not the correct answer.
### Step 4: Evaluate Option C - Fossil Fuels
- **Fossil Fuels** include coal, oil, and natural gas, which are major sources of energy.
- **Pollution Check**: The burning of fossil fuels releases greenhouse gases and other pollutants, contributing to air pollution and climate change.
- **Conclusion**: Fossil fuels cause pollution, so it is not the correct answer.
### Step 5: Evaluate Option D - Solar Energy
- **Solar Energy** is harnessed from sunlight using solar panels and other technologies.
- **Pollution Check**: Solar energy generation does not emit pollutants during operation. While there are some environmental impacts associated with manufacturing solar panels, the energy produced itself is clean.
- **Conclusion**: Solar energy is a source of energy that does not cause pollution.
### Final Answer
Based on the evaluations, the correct answer is **Option D - Solar Energy**.
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