The correct answer is C.
At the end of "Morte d'Artur," the narrator explains that perished and was taken away on the barge by his two aunts.
However, some people belived the King did not die, but left for other lands and would come back to finish de Crusades.
They believed that, on the stone over his grave, the engraving said: "Here lies Arthur, king who was, and king who will be."