The correct answer is B. These lines depict Heorot's grandeur.
In Beowulf, Heorot is Hrothgar's mead-hall, which is the place where the warriors drink and eat. This is also the hall that Beowulf defends against the monster. The hero saves Heorot from being attacked by Grendel. In this excerpt, Heorot is described as a splendid grand hall ("the greatest of hall-buildings"). Furthermore, its size, which is wide-reaching, is also characterized as impressive.