The correct answers are A) strict censorship and D) a secret police force.
Russian czars eliminated opposition to their rule by relying on strict censorship and a secret police force.
Czars in Russia wanted total power and exerted absolute political, economic, and social control over the nation. Citizens were oppressed under these radical policies and later those were causes of the Russian Revolution. The Czars tried to dissuade any rebellion or conspiracy by applying strict censorship to different or negative opinions about the regimen. Literally, freedom of speech did not exist in those years. And they had a secret police force that was created to immediately suppress any intent of rebellion. It was a total and brutal force of oppression.