The correct answers are B, C, and F.
B) Censoring books and newspapers: Both forms of government control apply strict censorship as individuals cannot claim any freedom of speech, thought and writing. The officials restrict or shut down completely any form of press, publication of books, radio, and/or television that's not under the regime's control.
C) Creating a powerful secret police force: In order to maintain control of the population, this type of government entities look to <em>keep people constantly afraid</em>, and one of the tools they use is terror. Whether its using a secret police that acts as vehicle of oppression, or also using other kind of armed forces that serve the purpose of creating a sense of constant threat.
F) Forbidding the practice of organized religion: Communism and Totalitarianism conceive themselves as a <em>potential replacement for the entities of faith</em> that a free country may decide to praise as another tool to ensure their grasp on power. Keep in mind that while totalitarianism is driven to establish itself as a new religion, Communism sees it more as an instrument of domination of the masses.