Explanation for Answer Choice E

I understood why D was the right answer. However, I wanted to confirm that my reasoning for why E is wrong is correct. At first I was debating between E and D because E shows to me that if there is information that is dispersed into several articles, then that means one is unable to get an exact measure of how many times that article was cited. So it is weakening the suggestion that measuring the usefulness this way would be a good idea. Also, it talked about controversies which is not relevant to the context of this question, that's why I marked it wrong.