The Declaration of Independence, which officially broke all political ties between the American colonies and Great Britain, set forth the ideas and principles behind a just and fair government, and the Constitution outlined how this government would function.
The answer is
C)It demonstrated that the new nation was likely to endure
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I wonder whether there would be also other options, but one very important aspect is the smog: the city center is where many industry-relevant things meet: the factories are all around it, transport, cars... and since it is surrounded by bad air, the air takes longer to dissipate. This is especially visible if the city is in a valley, such as Mexico city foe example.