Final answer:
King Arthur initially accepts the Green Knight's challenge to protect his honor and reputation, which aligns with the chivalric values he embodies as a noble king and warrior. The correct answer is option B.
Step-by-step explanation:
Why does King Arthur initially accept the Green Knight's challenge? The correct answer is B. To protect his honor and reputation. In the context of the Arthurian legend and chivalric code, the acceptance of a challenge by a knight, especially one of King Arthur's stature, was bound up with ideas of honor and the knightly virtues. As a noble king and warrior, King Arthur would be expected to respond to the Green Knight's challenge to uphold these values and demonstrate courage and leadership in front of his court.
In Arthurian lore, King Arthur is renowned not for seeking wealth or the love of a lady, but for his nobility, valor, and adherence to the chivalric code. Such aspects of his character are highlighted in literature, where he is often depicted as a paragon of knightly virtues, someone who is 'merciful and just in all men's eyes,' and 'true to his word, benign and honourable.'