(A) says, "Common law is more fruitfully studied as a relic of the history of the English people than as a legal code."
The problem with (A) is that the author sees the law as continuing to develop, so this answer choice doesn't work.
(B) says, "The “text†of common law has degenerated from an early stage of clarity to a current state of incoherence."
The issue with (B) is that it's far too negative, and the author would never agree with a statement this harsh.
(E) says, "The common law “text†inherited by future generations will differ from the one currently in use."
(E) is great. If we look at lines 53 and 54, we see the author states that the law is continually rewritten over time, so she would definitely agree with this statement. Thus, (E) is the correct answer choice.
Hope this helps. Let us know if you have any other questions!