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

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1 point
Thou shalt respect all weaknesses, and shalt constitute thyself the defender of them.
Thou shalt not recoil before thine enemy.
Thou shalt never lie, and shall remain faithful to thy pledged word.
A new love puts to flight an old one.

The rule in the Code of Chivalry that Sir Gawain broke and caused the Green Knight to mock him is "Thou shalt never lie, and shall remain faithful to thy pledged word."

In the story of Sir Gawain and the Green Knight, the specific rule of the Code of Chivalry that Sir Gawain broke was "Thou shalt never lie, and shall remain faithful to thy pledged word." This caused the Green Knight to mock him because Sir Gawain, out of fear and self-preservation, did not confess to breaking his agreement with the Green Knight. Instead, he withheld a magical green girdle given to him by the host's wife, which would have protected him from harm. By doing this, Sir Gawain broke his promise to the Green Knight, which violated the code of chivalry.

The rule in the Code of Chivalry that Sir Gawain broke and caused the Green Knight to mock him was "Thou shalt not recoil before thine enemy."