Let's find the correct answer choice with true information (i.e the assumption) in order for the given argument to be accurate.
Option A - Incorrect
This is not true regarding the passage. We are not concerned with the comparison between the number of night flights now and when the airport started.
Option B - Correct
According to the passage, there have been night flights in the airport since its inception, twenty years ago. Based on this, it factually correct to say that the complaining residents haven't purchased their homes during this time and they were aware of the night flights when they later bought their homes around the airport.
Therefore, the complaining residents can be said to have been living here for fewer than twenty years. Hence, this claim validates the accuracy of the passage argument.
Option C - Incorrect
This answer choice is clearly off point. The benefits that the residents gain from the presence of the airport are not relevant to the argument.
Option D - Incorrect
This claim goes too far beyond the scope of this argument.
Option E - Incorrect
This claim is incorrect - we can't confirm from the passage if the houses of the complaining local residents in Plainsville are near the airport or not.