Hey Greg. First of all, from what I know of where you're at and what you're trying to do, I'd recommend you get out of the low-numbered tests and keep your attention focused on more recent PTs, even if you're repeating ones you've already seen. Just my personal thoughts - trust your own experience.
This is a tough question because there is no perfect choice.
I still have a hard time with E, because the conclusion speaks of "justification of a policy" while answer choice E talks about identifying reasons that originally prompted the practice."
Keep in mind that principles support reasoning, not just isolated conclusions. In a ballpark sense, the objective is to take whatever evidence is presented in the argument, apply it to the correct principle, and automatically arrive at the conclusion. Thus there is an undercurrent of "sufficiency" to principles that "justify."
So when you say that the conclusion speaks of "justification of a policy," this is true, but the primary support for that justification comes from the evidence presented about the tradition.
(E) is the best loose fit for this, though it seems a bit specific.
I chose D, but now see another reason for eliminating it. The author does not advocate for "discarding traditional principles"
right.
The others are out of scope.