Final answer:
Option (a) True is correct, as Ethiopia has practiced Christianity since the 4th century. The nation's adoption of Christianity began with the missionary Frumentius converting King Ezana of the Aksumite Empire, leading to the establishment of the Ethiopian Orthodox Church with distinctive traditions.
Step-by-step explanation:
Ethiopia has indeed practiced Christianity since the 4th century, making option (a) True. The introduction of Christianity in Ethiopia is attributed to the missionary Frumentius, who after being shipwrecked on the Eritrean coast and taken to the royal court, converted King Ezana. Post conversion, Frumentius was appointed as a bishop by Athanasius, the bishop of Alexandria.
Over time, the localized Ethiopian Orthodox Church developed, maintaining unique practices and beliefs, such as a distinctive calendar and claims to the possession of the Ark of the Covenant.
Several Ethiopian rulers attempted to forge alliances with Rome, reflecting Ethiopia's early integration into the Christian world. The Aksumite Empire, with its capital at Aksum, is particularly noted for its conversion to Christianity during King Ezana's reign (c. 320-360).