I believe the answer is D.
D. To create a distinction between the educated nobility and the coarse lower classes.
Back in Shakespeare´s times, nobles were portrayed as highly educated and wise, making them talk in iambic pentameter rose them from the low educated characters in plays.
The author used this to emphasize that the poem is simply a memory and is no longer in that state.
<span>Revenge on Modred for seeking the Throne and Launcelot for committing adultery. Arthur doesn't want to fight with Launcelot. However, Modred gives offering and taunting for battles with Arthur.</span>
