Final answer:
The set of rules for being and remaining a priest in the medieval Christian Church is known as Canonical Law, which governs the ecclesiastical authority and its members, not to be confused with the Seven Sacraments or secular codes like Feudal Obligations or Chivalric Codes. the correct option is B. Canonical Law .
Step-by-step explanation:
the rules that a priest had to follow in order to be a priest:
The rules that a priest had to follow in order to be a priest and stay a priest are referred to as Canonical Law. Canonical Law consists of regulations developed by ecclesiastical authority, also known as Church Law, for governing a Christian organization and its members. These laws cover a variety of subjects, including the sacraments which are essential spiritual rituals conducted by ordained priests.
The Seven Sacraments, including Holy Orders, are the rites that must be administered by priests, but they are not the rules for being or remaining a priest. The Feudal Obligations and Chivalric Codes are related to secular and knightly systems and do not directly govern the clergy. Reform movements within the Church, such as the Cluniac movement, emphasized the importance of issues like simony and celibacy, and excommunication was a power held by the Church to enforce its laws, even among the nobility and monarchs.