What were men called who were pledged to do good deeds?

heretics

hospitalers

knights

Crusaders

The correct answer is option number three.

Although originally there was no specific code of conduct for Knights, later on however, - somewhere toward the end of the Middle Ages - the Code of Chivalry was established to govern the conduct and behavior of Knights

This code formulated guidelines for all knights to follow such as:

all knights should be honorable, merciful, honest and loyal. It also bound knights to protect those in need, particularly the poor and anyone unable to protect themselves, particularly women and children.

Answer: its C