The best answer for this question would be:
D. The scene most likely takes place during the climax.
The tone of the scene, centers on the climax because of how it narrated in the passage with every scene that had happened.
The following lines helped shows Grendel as a monster because as the kinsmen were sleeping, without them knowing that Grendel appeared, Grendel became excited(exultant) as the he saw the men were resting. He killed the sleeping men by splitting their bodies apart violently and gruesomely.