C. Western leaders said the pope in Rome had power over the entire church, while Eastern leaders did not recognize his authority over them.
This answer accurately reflects the differences in beliefs about church authority between the Western (Roman Catholic) and Eastern (Orthodox) churches during that time. The Western church, led by the pope, claimed universal authority over all Christians, while the Eastern church did not accept this papal supremacy and maintained a more decentralized structure with authority spread among various patriarchs.