Hey T.J.,
Thanks for your post. You’re right that the second to last sentence is the conclusion. That sentence starts with the conclusion key phrase "as a result." "As a result," like "therefore" and "so," almost always gives us a conclusion.
"Moreover" is more like "in addition." Phrases and words like "moreover," "in addition", and "also" usually give us supporting evidence. They’re the author saying, "hey, this also proves my point!"
Understanding these phrases can help you identify the argument core, but you can also think about the logical flow of the argument. What’s the author really saying here? He’s saying that the new legislation is dumb. Why? Because the new legislation fails to take into account home environment, and the current legislation is fine anyway.
In more concrete terms, the really boiled-down argument core here is:
P: Home environment determines dogs’ behavior rather than breed
C: Breed-specific legislation won’t protect us from vicious dogs.
Answer choice (A) gives us the correct conclusion.
Hope that helps!