Final answer:
The power of the pope emerged as the bishop of Rome's authority grew over time, with the role solidifying after the fall of Rome and the Great Schism of 1054, separating the leadership between the Roman Catholic Church in the west and the Eastern Orthodox Church. The answer is option A.
Step-by-step explanation:
The power of the pope evolved over many centuries as the bishop of Rome attempted to assert authority over the entire Christian church in the West.
This claim to leadership was anchored in the symbolic importance of Rome, the Petrine Succession, and the bishops' role within the Roman political system. Initially, the archbishops of cities like Alexandria and Damascus were of comparable importance, but over time, especially after the fall of Rome, the western branch of Christianity recognized the pope as its leader, a position not acknowledged in much of the eastern Empire. The Great Schism of 1054 further entrenched the divide, with the Patriarch of Constantinople heading the eastern branch and the pope leading the Roman Catholic Church in the west.
The pope's role as the spiritual head of the entire Church was gradual and not without contest, often intertwined with secular powers and political conflicts.