Final answer:
The correct answer to the student's question is b) Refuses all of them. Sir Gawain refuses all but one of the gifts presented by the lady of the castle, keeping only a green girdle which he believes will protect him from harm.
Step-by-step explanation:
In the story of Sir Gawain and the Green Knight, which pertains to Arthurian legends, Sir Gawain refuses all but one of the gifts offered to him by the lady of the castle. The lady attempts to seduce Gawain and offers him several gifts, each of which, except for a single green girdle, Gawain refuses.
He only accepts the girdle when she convinces him that it has the magical property of making the wearer invulnerable to harm, which is relevant to his upcoming challenge with the Green Knight. His acceptance of the girdle is done in secret, and he does not share this gift with his fellow knights. Therefore, the correct answer to the student's question is b) Refuses all of them.