I debated between A&D. Chose A. I had reasons for and against each.
Reasons to choose A : Lines 23-25. Also, the author mentions case-based reasoning might solve a lot of problems that rigid rule-based reasoning had (lines 38-41). So this hints that focusing on doctrinal rules was an impediment.
Reasons against A : The case-based systems still can use doctrinal rule-based law. So focusing on doctrinal nature of the law is not necessarily a fundamental error. Also, "focusing" doesn't need to imply "overly focusing" or "only focusing on", as I interpreted it above.
Reasons to choose D : Last sentence of second paragraph. Also lines 23-25.
Reasons against D : the word *cannnot* seemed too strong. I realize the last sentence calls the problem "intractable", but it is also focusing on improvements that indicate steady progress.
Any thoughts? RC is by far my worst section... so general advice is also verrrrrry welcome!!!!! Thanks!