Answer:
A. They believed that the church had moved away from its core teachings and become corrupt
Step-by-step explanation:
In the 1400's, lot of changes started to happen in Europe, and the majority of them were going against the Church and its power. One of the things that was happening that a constantly increasing number of people were dissatisfied with the Church because it became very corrupt, brutal, and moved away from the core teachings of the Christianity. This led to the formation of the Protestant Movement, which quickly escalated and the Church got divided, with the new Protestant Movement creating its own churches and teachings, while the Catholic Church lot of its followers, territory, and power. Unfortunately this also led to persecutions and lot of violence.