Answer:
D. third person omniscient
Step-by-step explanation:
Our narrator is absolutely all-knowing in the truest sense of the word. He sees and hears just about everything, and instead of narrating events from the point of view of just one two people, he opts to follow almost one hundred different characters on their adventures throughout the course of the story.
This strategy allows him to give a comprehensive tale of not just Arthur or those close to him, but of the whole Round Table. For example, when he narrates the Grail Quest, he does so in episodes, following Galahad for a while, then Gawain, then Launcelot, then returning to Galahad, etc. He can interweave the characters' stories, as when Percyvale, Bors, and Galahad emerge from their separate adventures during the Grail Quest to set sail on a mysterious ship together and achieve the quest.
For example, when the people of England defect from Arthur in favor of Mordred, the narrator launches into a long diatribe about the lack of loyalty of the English people, which he compares to the "new fangill"-ness of the modern English people (680.25&ff). Likewise, the narrator puts the devoted love between Launcelot and Gwenyvere on a pedestal in comparison to that of lovers "nowadayes" who lack "stabilyté," or faithfulness (625.3&ff).
I hope this helps you in any shape or form.