RC is killing me. Why is B (my choice) not correct and E is. To me they are both right. As usual lol.

The last pgh is often helpful in confirming the purpose of the passage. If the author ends with a discussion of the theory’s flaws, that tells us that pointing out those flaws is a central part of the passage’s purpose.

Also the theory is presented and explained for most of the passage, not so much held up against another theory as “better”.

It’d also be hard to defend B given the last paragraph’s content and tone.

EDIT typo

ETS explanation for why is correct just shows what phrases are the “basis” and support for the “limits” (dichotomy part). And then said all this “points to” choice E.

The first two paragraphs introduce and ground the discontinuity hypothesis. The third paragraph discusses the limits of the discontinuity hypothesis. The 'continuity' hypothesis is mentioned only once and is clearly not a focus of the passage. For (B) to be correct, it must be.