Gases that are commonly known as green house gases:-

Options

A. `CO_(2)` and `CH_(4)`
B. `N_(2)O` and CFCs
C. ozone
D. All the above

Answer

Step-by-Step Solution:

1. **Understanding Greenhouse Gases**: Greenhouse gases are gases that trap heat in the atmosphere, contributing to the greenhouse effect. This effect is essential for maintaining the Earth's temperature but can lead to global warming when concentrations are too high.

2. **Identifying Common Greenhouse Gases**: The most common greenhouse gases include:
- **Carbon Dioxide (CO2)**: Produced by burning fossil fuels, deforestation, and other human activities.
- **Methane (CH4)**: Emitted during the production and transport of coal, oil, and natural gas, as well as from livestock and other agricultural practices.
- **Nitrous Oxide (N2O)**: Released from agricultural and industrial activities, as well as during combustion of fossil fuels and solid waste.
- **Chlorofluorocarbons (CFCs)**: Synthetic compounds used in refrigeration, air conditioning, and aerosol propellants, which also contribute to ozone depletion.
- **Ozone (O3)**: While beneficial in the stratosphere for blocking UV radiation, ground-level ozone is a greenhouse gas.

3. **Conclusion**: All the gases mentioned in the options (carbon dioxide, methane, nitrous oxide, CFCs, and ozone) are recognized as greenhouse gases. Therefore, the correct answer to the question is "all of the above."

4. **Final Answer**: The correct option is D: all of the above.

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