The Brezhnev Doctrine asserted that the Soviet Union would interfere in Eastern European nations to preserve communist rule.
Brezhnev Doctrine - the doctrine expounded by Leonid Brezhnev in November 1968 affirming the right of the Soviet Union to intervene in the affairs of Communist countries to strengthen Communism.
The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.