The correct answer is option 4, which is Sulphur dioxide. Greenhouse gases are gases that trap heat in the Earth`s atmosphere and contribute to the greenhouse effect. They include gases like carbon dioxide (CO2), methane (CH4), ozone (O3), and chlorofluorocarbons (CFCs).

Option 1, Methane, is a greenhouse gas. It is produced by various natural processes and human activities, such as agriculture, landfills, and the extraction and use of fossil fuels.

Option 2, Ozone, is also a greenhouse gas. It is formed in the atmosphere by the interaction of sunlight with pollutants like nitrogen oxides and volatile organic compounds. While ozone in the stratosphere (the ozone layer) is beneficial, ozone in the lower atmosphere (troposphere) is a pollutant and a greenhouse gas.

Option 3, Chlorofluorocarbon (CFC), is a greenhouse gas. CFCs were widely used as refrigerants and aerosol propellants but are now phased out due to their harmful effects on the ozone layer.

Therefore, the correct answer is option 4, Sulphur dioxide. Although Sulphur dioxide is a pollutant and contributes to air pollution, it