The Soviet system did not allow which of the following things?

Opposition parties

The correct answer is Option 1 - Opposition parties

The Soviet system was based on a one-party political system dominated by the Communist Party. It did not allow opposition parties or political competition.

NCERT: "The Union of Soviet Socialist Republics (USSR) came into being after the socialist revolution in Russia in 1917. The revolution was inspired by the ideals of socialism, as opposed to capitalism, and the need for an egalitarian society. This was perhaps the biggest attempt in human history to abolish the institution of private property and consciously design a society based on principles of equality. In doing so, the makers of the Soviet system gave primacy to the state and the institution of the party. The Soviet political system centred around the communist party, and no other political party or opposition was allowed. The economy was planned and controlled by the state."