By 900 ce, kiev controlled the large area between the baltic sea and the black sea, which made kiev
a. difficult to rule.
b. difficult to defend.
c. a very powerful state.
d. want to expand even further.

The correct answer is C) a very powerful state.

By 900 CE, Kiev controlled the large area between the Baltic Sea and the Black Sea, which made Kiev a very powerful state.

Kiev was a dominant and powerful empire in medieval times. It has an economic and political dominance over other territories. The Vikings from Sweden migrated to this area of Kiev in what today is Ukrania. Indeed, Kiev is today’s capital of Ukrania. Viking King Rurik established a settlement in this region. In 980 CE, Vladimir the Great reigned a prosper territory in peace that controlled the large area between the Baltic Sea and the Black Sea, which made Kiev a very powerful state.  

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.

as the maasai legends tell, "in the beginning of the world, enkai was the only god: the guardian of rain, fertility, sun, and love. with that love, enkai birthed three sons." solución