Answer:
a. The sale of indulgences is a proper revenue source for a church.
Step-by-step explanation:
The term Lutheranism is attributed to the teachings of Martin Luther who has interpreted the Christian theology and the largest branch of Christianity was carved out known as Protestantism. The central idea of Martin Luther's ideology is that faith and devotion are the only source to reach God. The authority of clergy of the sale of Indulgences in exchange for favors from the sinners brought him in direct conflict to the orthodox section of the Church. He said that scriptures were the only legitimate authority, thus undermining the position of the clergy.