Answer:
C) Orthodox
Step-by-step explanation:
In 988 AD, Vladimir the Great was baptized thereby becoming a Christian. However, he joined Orthodox Christianity for many reasons: among which is that he his closest neighbor, Byzantines were Orthodox Christians, hence he was able to form a credible alliance with the Byzantine
Also, it is believed that Orthodox Christianity allowed Vladimir Rus and his people to enjoy partying and other merry festivals including the taking of alcohol