The correct answer is A. Burn a lot of fossil fuels.
Smog, a type of air pollution, is often associated with urban areas that burn large amounts of fossil fuels, such as coal, oil, and gasoline. These fuels release pollutants like nitrogen oxides, sulphur dioxide, and particulate matter into the atmosphere, which can react with sunlight and other chemicals to form ground-level ozone and smog.
While options B, C, and D may be related to urban areas, they are not the primary cause of smog. Burning fossil fuels is the main culprit!
There is an explanation video available below.
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