Compressed Natural Gas (CNG) is

Options

A. propane
B. methane
C. ethane
D. butane

Answer

**Step-by-Step Solution:**

1. **Understanding CNG**: Compressed Natural Gas (CNG) is primarily composed of methane (CH4). It is a cleaner alternative to other fossil fuels and is used widely as a fuel for vehicles.

2. **Analyzing the Options**:
- **Propane**: A hydrocarbon that is part of liquefied petroleum gas (LPG), not CNG.
- **Methane**: The main component of CNG, making it the correct answer.
- **Ethane**: Used in the chemical industry but not a primary component of CNG.
- **Butane**: Another component of LPG, not CNG.

3. **Conclusion**: Since CNG is primarily made up of methane, the correct answer to the question "Compressed Natural Gas (CNG) is" is **methane**.

**Final Answer**: Compressed Natural Gas (CNG) is primarily composed of **methane**.

---