Dear gurus,
Line 30 clearly states that "the best way to address concerns about judicial impartiality is to require judges to make their reasoning transparent", and to implement such a transparency is "requirement of a written explanation (by the judge)".
I guess maybe a little stretch, but "concerns" above in my impression is a "public" concern -- or could any other parties (say government agencies, prosecutions) be more concerned of judicial impartiality than the public does? Therefore 12 D which says written explanation can improve the public perception of the impartiality of the judiciary seems an appropriate answer to this question.
B seems also a little too strong -- "any faulty ... in principle can be detected." How can the passage support this viewpoint as to detecting "any faulty in principle"? Contrasting to this, 12 D using the form like "xxx can improve" seems more objective.
Thanks for any opinions offered by any folks.