What was the official language of the byzantine empire? Latin greek french italian

The correct option is: Greek

In the origins of the Byzantine Empire there was a situation of diglossia between Latin and Greek. The first was the language of the state administration, while the Greek was the spoken language and the main vehicle of literary expression. The Church and education also used Greek. To this must be added that some regions of the Empire used other languages, such as Aramaic and its variant, Syriac, in Syria and Palestine and Coptic in Egypt. In the year 620 replaced the Latin for the Greek as administrative language in 620, after which the Empire had a marked Hellenic character

Greek, as it was spoken more widely than Latin was at the time