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Flaw in the Reasoning-#%. The correct answer choice is (B)
In this case the author provides several numerical premises, followed by a flawed conclusion. Out of 1000 workers, an average of 10 are sick each day, a scenario that allows the plant to run produce at its normal rate.
Based on the above information, the author draws the conclusion that 10 employees could be fired without the plant losing productivity. The problem with this logic is this: the author seems to think that having an average of 10 sick is the same as having 10 employees who are sick every day. The author is missing the fact that, based on the statistics provided, an average of 10/1000, which is equivalent to 1/100, or 1%, of the companies employees are sick each day. So in reality, if 10 employees were fired, that would leave 990, and we would still most likely continue see 1%, or about 10 (9.9) sick on average.
Answer choice (A): The author doesn't "ignore" this possibility, as the argument does not require it. Regardless, this would strengthen the author's conclusion, rather than show a vulnerability in the argument.
Answer choice (B): This is the correct answer choice. There is no reason to believe that the percentage of the staff that is sick on any given day will change from the current 1%. If the absentee rate didn't drop, and about 10 people were sick after the firings, there is no way to know whether a loss of productivity would result.
Answer choice (C): The author does not make this presumption. Rather, the author takes the fact that a loss of 10 on any given day is allowable without a drop in productivity, and concludes that firing 10 would also allow for no change in productivity rates.
Answer choice (D): This is not the flaw displayed in this stimulus. The flaw concerns the author's misinterpretation of percentages and statistics.
Answer choice (E): The author certainly does not take this for granted, but instead draws the conclusion in part from the specific fact that 10 could be lost on any given day without a resulting loss in productivity.