The responsibility of the Soviet Union is to intervene, if necessary, in support of other communist governments.
Brezhnev Doctrine declared that any challenge to the socialist rule in any Soviet bloc country in Central and Eastern Europe was a threat to all of them.
In 1968, it was given by the Soviet leader Leonid Brezhnev.
It was given to the countries where socialism was under threat.
Thus, the correct option is B.
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