"I swear through fire and ice/To be your humble knight."
Chivalry is the moral code of knights during medieval times. The last option is the best because it demonstrates the loyalty of the knight to his king. It also shows him to be humble which is another trait of chivalry. Being head of the court does not show any moral code, and neither does how his hair looks with the crown. Option C is also not correct because it doesn't say anything about a knight; it only details the behavior of a woman.