(B) is hopeless, so long as you keep the background that the author is arguing we SHOULD study common law in its historical context.
If the author has a prescriptive, opinionated tone, then a neutral "supply a chronological summary" would pretty much always fail to be a correct answer.
You ironically picked the two answers that are their favorite when it comes to Purpose-bait:
- summarize
- compare/contrast
I guess we did this so much in high school / college that we tend to still think in terms of these purposes.
LSAT authors always have way more specific points they are trying to make. It's never just a list / a summary. If they actually do tell a chronological story, it's still to highlight an interesting takeaway.
And I've never seen a passage where the author just neutrally compares/contrasts. An author will either present a complex debate (and stay out) or the author will get involved and side more with one than the other (at which point "compare/contrast" is too neutral).
(D) is way more tempting here than (B) because (D) has that redemptive second half that says the author is "suggesting how these theories should be studied".
The author is DEFINITELY suggesting how common law should be studied.
But common law isn't a legal theory. It's an "unwritten code of time-honored laws derived from custom and precedent".
Line 18 makes it clear that legal theories attempt to interpret common law. Common law isn't itself a legal theory.
If you kept (D) as is, then you'd need to change the entire passage and actually have it discuss any of the interpretive theories referenced in line 18.
The author compares/contrasts mainstream vs. atypical legal theories in lines 16-21 (most of them don't acknowledge history ... the exceptional ones that DO acknowledge history don't do a good job of connecting the history to the contemporary significance).
The author never compares/contrasts theories of the past vs. the present.
An easier way to fix (D) is to change the answer, not the passage.
(D) contrast the typical way that common law is studied with the way the author suggests that common law should be studied
(B) is pretty much irredeemable for this (and almost every other LSAT) passage.
A chronological summary of the history of an idea is pretty ambitious thing to fit into one column of text on one page.
