Question

one of the first things vladimir i did after he became the ruler of kiev was to
force the population to submit to his authoritarian rule.
make orthodox christianity the state religion.
isolate kiev so that trade virtually stopped.
create a strong military for kiev’s defense.

Explanation:

To solve this, we recall historical facts about Vladimir I of Kiev. Vladimir I (Vladimir the Great) is known for converting to Orthodox Christianity and making it the state religion of Kievan Rus'. The other options are incorrect: he wasn't primarily known for authoritarian rule (first option), isolating Kiev would go against trade interests (third), and while military was important, his key act was religious conversion (fourth is less defining than the religious move).

Answer:

B. make Orthodox Christianity the state religion.