The correct answer is option B, Slavic.
Moravia is a Central European Country which lies in the Eastern part of Czech Republic. In order to maintain the political and religious sovereignty of the Empire, the king of Moravia Rostislav requested to the Emperor of Byzantine named Micheal III, to send the masters of Scriptures. After accepting the offer from the king of Moravia, Micheal III sent the two brothers Constantine and Methodius to Moravia. Hence, they two prepared a Slavic alphabet for the scriptures, and at the same time, Constantine initiated the translation of Bible and Liturgy with the help of Methodius in the Slavic language.