Final answer:
The Great Schism of 1054 AD resulted in the split of the Christian Church into the Eastern Orthodox Church and the Roman Catholic Church.
Step-by-step explanation:
The Great Schism of 1054 AD ultimately accomplished Option A: A split of the Christian Church. This event marked the separation of the eastern and western churches, with the eastern branch becoming the Eastern Orthodox Church and the western branch becoming the Roman Catholic Church. The split was fueled by differences in language, cultural practices, and authority within the church. Following the Great Schism, each branch maintained its own hierarchy and organization.