Dave,
Thank you very much for taking the time to answer my question in such a detailed manner.
I still feel this is a normative versus positive issue in that a necessary assumption of your answer is that the idiom "within the purview of" is defined as “within the rights of” (normative) instead of “within the power or scope of” (positive). So, I agree with your entire analysis that (A) would believe that “nullification exists, and to achieve it juries interpret the law, but should not be doing that.” (i.e. the juries have the power to interpret the law by definition that jury nullification exists, but not the right to do so). I could see (A) saying “It should not be within the purview of juries to interpret the law” (i.e. implicitly recognizing it is within the purview but should not be).
I looked up the idiom “within the purview of” which yields results that could justify either interpretation.
https://www.ldoceonline.com/dictionary/ ... -something
formal within or outside the limits of someone’s job, activity, or knowledge
https://www.thefreedictionary.com/purview
The extent or range of activity, function, power, or competence; scope.
So, (A) would say jury nullification is having juries interpret the law which is, but should not be, within their purview (i.e the range of their activities, functions, powers or competences – by virtue of their nullifying).
Taking several steps back though, I have learned not to get tripped up on language so much especially on easier questions like this one in which 75% got the question right. My prior post was posted on May 10th and up until that point I had averaged 6.7 questions wrong per reading comprehension section — never scoring better than a -6 — on my 3 practice exams. Since May 10th, I have taken 5 diagnostics (PrepTests 72, 74, 75, 76 and 80) and averaged only 3.6 questions wrong per reading comprehension section achieving my best result of -2 today on PrepTest 76.