This sentence would be taking advantage of "hyperbole" since it is using an exaggerated statement to further a basic idea--not to be taken literally that the fire actually "swallowed up" the house.
In my opinion, the correct answer is B. <span>one adjective clause. This clause is "</span><span>which is perhaps the most famous border ever established by surveying methods". It modifies the subject ("The Mason-Dixon line"), providing an additional description for it.</span>
