The country that possessed an extremely socialist system during the 1960s and 1970s would be:
C). USSR
Socialist System
Socialist System is characterized as the system in which the focus is laid upon the people or public and providing equal opportunities to everyone.
In such a system, the resources are owned by the people equally and collaboratively.
As per the question, during the 1960s and 1970s, USSR was the most socialist in its policies in comparison to the other states(in options) as it became a socialist in 1922 itself.
