What rule in the Code of Chivalry, did Sir Gawain break and cause the Green Knight to mock him?

How does Sir Gawain betray the Lord and break the code of chivalry? He doesn't keep his word. He doesn't give The Lord the sash because he wants to keep it to save his own life.

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.