Answer:
Option: He converted to Orthodox Christianity
Step-by-step explanation:
Vladimir, Prince of Kiev in 988 converted in Christianity to unify his people. He became the first Christian ruler to rule in Kievan Rus. Christianity remains in Kiev before Vladimir rule. When the trouble started in the Byzantine Empire during the reign of Basil II, Vladimir requested to sent military support. In 988 Vladimir converted into Orthodox Christian and ordered the Christian conversion of Kiev and Novgorod.