Final answer:
The best paraphrase of King Arthur's words is that he regrets losing Sir Gawain and Sir Launcelot, conveying his affection for them.
Step-by-step explanation:
The best paraphrase of King Arthur's words to the dying Sir Gawain, "for now, my nephew Sir Gawaine, I will discover me unto your person: in Sir Launcelot and you I most had my joy, and mine affiance, and now have I lost my joy of you both..." from Book XXI, Chapter II, is: A) King Arthur regrets losing both Sir Gawain and Sir Launcelot and shares his affection for them.
This paraphrase captures the sentiment of loss and fondness that King Arthur is expressing towards his nephew, Sir Gawain, as well as Sir Launcelot - the two individuals in whom King Arthur found the greatest happiness and trust.
The best paraphrase of these words of King Arthur to the dying Sir Gawain is:
A) King Arthur regrets losing both Sir Gawain and Sir Launcelot and shares his affection for them.
In this quote, King Arthur expresses his sadness and sorrow at losing his joy from both Sir Gawain and Sir Launcelot. He mentions that he found the most joy and trust in both of them, but now he has lost that joy due to their current situation. This paraphrase captures the emotional context and the relationship between King Arthur and his knights.