The correct answer is "protection".
In feudal society, a vassal was a person invested with a fief for which they had to povide services to a lord. First, a feudal contract was made, and under that contract, the lord was bound to provide the vassal with the fief, i.e. to provide protection and to do him justice in court. In return the Lord could demand the services which were attached to the fief, and these could include all kinds of services - military, administrative etc.
Many events occurred in the beginning of 16th
century, a few years before Martin Luther began the Protestant Reformation. It includes clergy abuse. This led to people criticizing
the Catholic Church. However, there was
a split of religion over doctrine, not corruption or clergy abuse.