The Russian Empire expanded in part because A.) Non-Russian peoples wanted to be ruled by the Russian czar.
B.) Russia's czars wanted to create a secure border for their empire.
C.) Russia's czars wanted to spread Communism throughout the world.

Correct answer is B.) Russia's czars wanted to create a secure border for their empire.

Explanation:

Option A is not correct as it is not correct that many Non-Russians wanted to be ruled by Russians. Some of them even started uprisings against the Russian reign.

B is correct as with the expansion of the Empire the borders were strengthened. This especially refers to the period of tsar Peter The Great and Catherine The Great.

C is not correct as tsar fought against Communism. After tsar was overthrown Communism is introduced in country.

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