Final answer:
The split between the Roman Catholic Church and the Orthodox Church was mainly caused by the reorganization of the Roman Empire into two halves.
Step-by-step explanation:
The factor that most contributed to the split between the Roman Catholic Church and the Orthodox Church was C. the reorganization of the Roman Empire into two halves. This event, known as the Great Schism of 1054, led to a permanent divide between the eastern and western branches of Christianity. The reorganization of the Roman Empire into the East and West created cultural, political, and theological differences that eventually led to the split.
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