Answer:
A.
Step-by-step explanation:
The Great Schism was a period of division between the Eastern and Western churches. The eastern and western churches shared the same faith till the Great Schism, which is arising of conflict between the eastern and western Christians that ultimately led to the division between the two. After the Great Schism, churches in Rome and Avignon were reigned by popes.
Therefore, the correct answer is option A.