Answer :
One party system was the common feature of Italy, Germany and Russia during the first half of the 20th century.
What is a one-party system?
The assumption of control and functioning over a region by a sole political group is known as the one-party system. No other political party is allowed to participate.
This system was active during the 1930s in the countries like Germany, Italy and Russia that followed forms such fascism, Nazism and Communism in their governance and denied basic human rights to their citizens.
Hence, option D holds true regarding the one-party system during the 1930s.
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