Answer:
D. The movement to change the Catholic church that ultimately led to division in the Christian religion.
Step-by-step explanation:
The Reformation started when a man named Martin Luther studied the bible and found that many points of the Catholic Church and the Bible did not agree. This caused him to be kicked out of the Catholic Church and many decided to agree with him that the churches ways were incorrect. This eventually caused many wars, but a new form of Christianity came to light, called Protestantism.