请教feifei逻辑-1的A选项

1. Although 90 percent of the population believes itself to be well informed about health care, only 20 percent knows enough about DNA. So apparently at least 80 percent of the population does not know enough about medical concepts to make well-informed personal medical choices or to make good public policy decisions about health care.

The argument’s reasoning is questionable because the argument fails to demonstrate that

(A) those people who can understand news stories about DNA are able to make well-informed personal medical choices

(B) more than 20 percent of the population needs to be well informed about health care for good public policy decisions about health care to be made

(C) one’s being able to make well-informed personal medical choices ensures that one makes good public policy decisions about health care

(D) an understanding of DNA is essential to making well-informed personal medical choices or to making good public policy decisions about health care

(E) since 90 percent of the population believes itself to be well informed about health care, at least 70 percent of the population is mistaken in that belief.

答案是D，想请问一下A为什么不对？我觉得A不对是因为他说的是news stories about DNA,并不是DNA，者可以看做是一个无关选项，不知道想法对不对，因为狒狒逻辑宝典里面说A支持了选项。我觉得宝典说的不对，不知道我的想法对还是宝典里对。

另外，我现在逻辑效果很不好，错误率高并且时间也不够用。不知道应该做陈向东的还是做狒狒的。请高手指教啊！

恩！感谢！懂了！