The early eastern european slavic civilization at
kiev adopted the eastern orthodox religion, the
cyrillic alphabet, and certain styles of art and
architecture as a result of
(1) wars with japan
(2) conquests by mongol invaders
(3) visits to western european countries
(4) trade with the byzantine empire

The early Eastern European Slavic civilization at Kiev adopted the Eastern Orthodox religion, the Cyrillic alphabet, and certain styles of art and architecture as a result of trade with the Byzantine Empire. So the correct option for this question is option “4”. Literacy was given great preference in the Byzantine Empire and that is the reason behind the high number of literate people in this Empire. Most military personnel, Clergy, manufacturers and merchants had a minimum primary education as their educational base.