The correct answer is D. The Roman Catholic Church was headed by the pope and rituals were in Latin; the Eastern Orthodox Church was headed by the Byzantine emperor and rituals were in Greek.
Step-by-step explanation
Once the sacraments around the Roman gods were left behind, Catholicism was adopted in the Roman Empire, so the Pope was recognized as the highest authority of religion, and Latin was adopted as the main liturgical language. However, in the Eastern Roman Empire (Byzantine Empire), between the 8th and 11th centuries, the Greek Orthodox Church was formally established around the Patriarch of Constantinople (Byzantine emperor), and the Greek language was adopted as the main liturgical language. Therefore, the correct answer is D. The Roman Catholic Church was headed by the pope and rituals were in Latin; the Eastern Orthodox Church was headed by the Byzantine emperor and rituals were in Greek.