This one definitely forces you to think. It could be that as few as a handful of people said they were most influenced by the bible and 1984 (let's just say 10 and 8, respectively, for simplicity's sake) and the rest are a random menagerie of choices. Well, then the conclusion that a great number of people are influenced by 1984 simply doesn't follow.

#feedback Shouldn't the title read "An Organ in a System"?

What helps me, especially with harder NA questions, is to re-read the stimulus as well as the question stem. This question is somewhat unique because it specifically asks about the necessary assumption concerning the copper tools. In this way, B makes the most sense by far.

This is an apt example of "don't let perfect be the enemy of good." C isn't perfect, but it's the best choice. A and E try to gaslight you. Also, note that (accordingly) throughout the passage, the support references research that doesn't cite being in a legal setting. It makes the "may influence jurors" part of C even stronger.