We are being asked the author's opinion on Dworkin's theory. From the passage, it seems that the author agrees with Dworkin. The final paragraph in particular shows that the author support;'s Dworkin, and does not raise any real objections or modifications to this agreement.
This is a good match for (A).
The author does not show any caution about Dworkin, so we can reject B. The author is not hoping that Dworkin will be disproved, so we can reject C. There was no support for D's claim that the only reason Dworkin matters was the originality of his theory. E does reflect the author's bias towards Dworkin theory, but the author does not show which theory they think will win. In fact, this uncertainty is reflected in lines 1-4.
