Correct option is B
Gas engines, particularly those running on natural gas, are likely to produce the least pollution compared to petrol, diesel, or kerosene engines. Natural gas is a cleaner-burning fuel, emitting lower levels of carbon dioxide (CO₂), nitrogen oxides (NOx), and particulate matter (PM) compared to diesel or petrol engines. The combustion of natural gas generates less harmful emissions, making gas engines more environmentally friendly.
Petrol engines emit higher amounts of carbon monoxide (CO) and hydrocarbons (HC) due to incomplete combustion.
Diesel engines, though more fuel-efficient, produce significant amounts of nitrogen oxides and particulate matter, which contribute to air pollution.
Kerosene engines are typically less efficient and produce higher levels of pollutants compared to gas engines.
Gas engines, particularly those that run on compressed natural gas (CNG), are widely promoted in urban areas as a cleaner alternative to reduce vehicular emissions.
