中秋国庆快乐！求助于一道狒狒逻辑！感激不尽！

小灰灰养大鸟

94. When 100people who have not used cocaine are tested for cocaine use, on average only 5will test positive. By contrast, of every 100 people who have used cocaine 99will test positive. Thus, when a randomly chosen group of people is tested forcocaine use, the vast people is tested for cocaine use, the vast majority ofthose who test positive will be people who have used cocaine.

A reasoning error in theargument is that the argument

A.      attempts to infer a valuejudgment from purely factual premises

B.       attributes to every member ofthe population the properties of the average member of the population

C.       fails to take into account whatproportion of the population have used cocaine

D.      ignores the fact that somecocaine users do not test positive

E.       advocates testing people forcocaine use when there is no reason to suspect that they have used cocaine

答案是C

求NN点拨一下~、

不胜感谢！