Question

in what way did the soviet union try to spread communism around the world?by introducing social democracyby creating buffer zonesby supporting revolutionary movementsby infiltrating foreign governments

Explanation:

Social democracy is a distinct ideology separate from communism, so it is not a method the Soviet Union used. Buffer zones were established for defensive purposes (to protect the Soviet Union from invasion) rather than to spread communism. While some infiltration occurred, the primary and most widely documented method the Soviet Union used to spread communism globally was providing financial, military, and ideological support to communist revolutionary movements in various countries.

Answer:

C. by supporting revolutionary movements