The Great Schism of 1054 was the final split between the Roman Catholic Church and the Eastern Orthodox Church. What event provided the final reason for this split? a. the Pope’s decision to organize the First Crusade to Jerusalem
b. the Fourth Crusade, when the Crusaders sacked Constantinople
c. the Patriarch’s decision not to bless or join any of the Crusades
d. Russia’s choice of Eastern Orthodoxy over Roman Catholicism as a state religion