CNG is better than diesel because (a) it is cheaper (b) burns most efficiently (c) can be shiphoned off

Options

A. All except (a)
B. All except (b)
C. All except (c)
D. only (b)

Answer

To determine why CNG (Compressed Natural Gas) is considered better than diesel, let's analyze each option provided in the question step by step.

### Step 1: Analyze Option (a) - CNG is cheaper than diesel.
CNG is generally cheaper than diesel. This is due to various factors including production costs, taxes, and market demand. Therefore, this statement is true.

**Hint:** Consider the economic factors influencing fuel prices when evaluating cost-effectiveness.

### Step 2: Analyze Option (b) - CNG burns most efficiently.
CNG burns more efficiently than diesel. It produces fewer harmful emissions and leaves almost no residue after combustion. This means that it is cleaner and more efficient in terms of energy output. This statement is also true.

**Hint:** Think about the environmental impact and efficiency of different fuels when assessing combustion properties.

### Step 3: Analyze Option (c) - CNG can be siphoned off.
This statement is false. CNG is a gaseous fuel and cannot be easily siphoned off like liquid fuels such as diesel or petrol. It requires specialized equipment for storage and transfer, making it difficult to steal in the same way as liquid fuels.

**Hint:** Consider the physical state of the fuel and how it can be stored or transferred when evaluating this option.

### Conclusion:
Based on the analysis:
- Option (a) is true: CNG is cheaper.
- Option (b) is true: CNG burns more efficiently.
- Option (c) is false: CNG cannot be siphoned off.

Thus, the correct answer is that CNG is better than diesel because of its cost-effectiveness and efficiency, but not because it can be siphoned off.

### Final Answer:
CNG is better than diesel because (a) it is cheaper and (b) it burns most efficiently. Option (c) is incorrect.