Burning fuels primarily produces which of the following emissions?

Burning fuels primarily produces a variety of emissions, among which sulfur dioxide is significant, particularly from the combustion of fossil fuels that contain sulfur, such as coal and oil. When these fuels are burned, the sulfur present in them combines with oxygen to form sulfur dioxide (SO₂), a gas that can contribute to air pollution and acid rain.

While carbon monoxide is also a notable emission from incomplete combustion, and various processes can lead to ozone formation, the question is specifically focusing on the primary products of fuel burning. Sulfur dioxide stands out as a major emission from the combustion of certain fuels, particularly those containing higher levels of sulfur.

On the other hand, nitrogen trifluoride is not typically associated with fuel combustion; rather, it is more relevant in specific industrial processes. Ozone typically forms in the atmosphere as a result of chemical reactions involving pollutants like nitrogen oxides and volatile organic compounds, rather than being a direct emission from burning fuel. Therefore, sulfur dioxide is the most appropriate choice in this context due to its direct production from the combustion of sulfur-containing fuels.