Answer:
The correct answer is A. Military and secret police
Step-by-step explanation:
The Soviet Union had a lot of Satellite States, some of which were completely different, culturally, linguistically and religiously.
The Southern States of Kazakhstan, Turkmenistan etc were Muslims countries with their own Turkic language and culture.
The States in Europe such as Poland and Czech had their own language and local culture as well.
The Soviet's used military might and a secret Police to install their preferred governments. The smallest of rebellions were quickly controlled and the secret police helped to scare local populations into submission.