The statement that BEST explains a flaw in the author's reasoning is " The author assumes that what is true of a part is also true of the whole when it comes to small businesses and community health." (Option A)
Flawed reasoning is one whose logic is erroneous. When a person's reasoning is faulty, it is a strong basis to discredit their argument because such reasoning can be misleading.
Hence, the statement that BEST explains a flaw in the author's reasoning is " The author assumes that what is true of a part is also true of the whole when it comes to small businesses and community health." (Option A)
This kind of flaw is called the error of hasty generalization.
Learn more about Faulty or flawed reasoning at:
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