Hi LSAT4Life! Happy to help with this
Great job identifying why answer choice (A) is incorrect! Let me explain a bit further, as well.
Answer choice (A) tells us that Goodrich believes common law should be studied as a "relic of history." However, Goodrich actually believes that common law should be studied as a "continually developing tradition." These two ideas are contradictory, making answer choice (A) incorrect.
In other words, answer choice (A) directly contradicts Goodrich's view: he believes that it should be studied as a "continually developing tradition," but answer choice (A) explains that it should be studied as a "relic of history." If we study something as a relic of history, we are not studying it as something that continues to develop, but instead, as something that is already fixed/static.
So not only does answer choice (A) not capture this idea of continual development, but it actually contradicts Goodrich's view by saying that we should study common law as a "relic of history."
I hope this helps, and please let me know if you have any other questions!