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“The Green Knight's original challenge was for someone to step forward and strike him with his own axe under the condition that he meet him again one year later to receive a blow in return. Arthur steps up to the challenge, but in order to protect him, Sir Gawain steps up and meets the challenge instead”.
Hope this helps:)
The thesis statement is at the end of the introduction paragraph, and summarizes the whole essay.
Teacher B is correct.
