Answer:
Correct answer is B.) Russia's czars wanted to create a secure border for their empire.
Step-by-step 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.