Chivalry is the correct answer because it refers specifically to the code of conduct that guided knights during the Middle Ages. This code emphasized virtues such as bravery, courtesy, honor, and respect for women and the weak. Chivalry was not just a set of rules but a cultural ideal that shaped the identity and duties of knights, encouraging them to act in a noble manner both on and off the battlefield.
Chivalry also included the principles of loyalty to one's lord and the protection of those who could not protect themselves, which were central to the knightly experience. This adherence to chivalric values influenced the behavior of knights in military settings and their interactions with society at large.
The other options like the Code of Ethics, Feudal Law, and Knighthood Honor, while they may relate to aspects of medieval society, do not specifically denote the established guidelines for knightly conduct that chivalry represents. For instance, Feudal Law pertains to the legal system governing land and lordship, and a Code of Ethics could refer to various ethical standards in different contexts, lacking the unique characteristics associated with the knights’ duty and honor.