deucebigalow wrote:
Why not D?
The author mentions the increase in the number of bird species as a sign of improved air quality. The public may or may not desire the increase in the number of birds. The main target is improving the air quality with or without an increase in the number of birds. Why would the author assume that it is a desired outcome or not?
Take your understanding of the conclusion a little further by reading the prompt one more time. Then come back here!
The main target is improving the air
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