Given below are two statements, one labelled as Assertion A and the other labelled as Reason R.Assertion A: For more than a hundred years all Russian governments have sought to respond over Eastern Europe. But only since the Red Army reached the Elba River have the rulers of Russia been able to realize the ambitions of the Russian Empire and the ideological purposes of communism.Reason R: The casual factors are territorial expansion and ideological learnings.Codes:

• A. Both A and R are true but R is not the correct explanation of A.
• B. Both A and R are true and R is the correct explanation of A.
• C. A is true but R is false.
• D. A is false but R is true.