If we're talking about ethos, pathos, or logos, the answer is ethos
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It can be said that chivalry affected the characters when the Knights exhibited their behavior. The Green Knight challenged the knights´honor and so Sir Gawain asked the King to accept that challenge. It seems that he wanted to show his loyalty (value of Chivalry) to King Arthur. Later on, the Green Knight promised to keep his word (value of Chivalry).
Answer - B. Chronological Order
Reasoning - It describes the occurred from first to last but especially arranges info. step by step order that describes the (Process)<<===. Which leads us back to the question what kara was writing about a complex process with (steps)
(hint hint). Which proves to be a chronological order.