The answer can be reached by elimination. "B" says not related to the information in the conclusion, however it is related. In "C" "neighbors playing music" is just an analogy. In "D" it does not undermine; on the contrary it supports and "E" is not even relevant.So we are only left with "A" which is the correct option since "A" gives an explanation that why airports are also necessary and cannot be standardized with other examples.
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