To solve this problem, we need to determine which statement about the conversion of buses to CNG is false. Let's analyze each option:$\newline \bullet$Option 1: CNG burns more efficiently than diesel.$\newline$ - CNG (Compressed Natural Gas) is known for its cleaner and more efficient combustion compared to diesel.$\newline$ - This statement is true.$\newline \bullet$Option 2: The same diesel engine is used in CNG buses making the cost of conversion low.$\newline$ - Converting a diesel engine to run on CNG typically requires significant modifications or a complete engine replacement.$\newline$ - Therefore, the cost of conversion is not low, and this statement is false.$\newline \bullet$Option 3: It is cheaper than diesel.$\newline$ - CNG is generally cheaper than diesel, making it a cost-effective alternative fuel.$\newline$ - This statement is true.$\newline \bullet$Option 4: It cannot be adulterated like diesel.$\newline$ - CNG is less prone to adulteration compared to liquid fuels like diesel.$\newline$ - This statement is true.$\newline$Based on the analysis, the false statement is:$\newline$Option 2: The same diesel engine is used in CNG buses making the cost of conversion low.$\newline$Therefore, the correct option is Option 2.