Answer: A. The creation of the Cyrillic alphabet so that Slavic people could read the Bible.
Explanation:
The Byzantine Empire(Eastern Roman Empire)was formed in the 10th century after the petition of the Roman expire. Which had Constantinople as the capital, in ancient times it had greatly impacted by both Eastern and Western cultures. The Byzantine Empire held the language, culture and tradition of the Greek people which became the foundation of the Roman culture. Christianity was one of the major religion that was spread throughout Byzantine empire with the creation of the Slavic Orthodox churches and the Cyrillic scripts coined from the Greek to help the people read the Bible.