What Was the Result of Basil II's Alliance with Vladimir

What was the result of Basil II's alliance with Vladimir I of Russia?

A) The two countries established strong commercial and cultural ties.
B) The alliance exposed the Byzantine Empire to damaging raids from Vikings.
C) The region was opened to Islam,and much of Russia converted as a result.
D) Western Europe became increasingly alienated from the Byzantines.
E) The alliance made the Macedonian dynasty more secure in its power.