What was the nazi soviet? why was the nazi soviet pact surprising?

 officially known as the Treaty of Non-aggression between Germany and the Union of Soviet Socialist Republics, was a neutrality pact between Nazi Germany and the Soviet Union signed in Moscow on 23 August 1939 by foreign ministers Joachim von Ribbentrop and Vyacheslav Molotov, respectively. it was suprising because the soviets were an allied power in ww2

Explanation:

The Nazi-Soviet Pact was a non-aggression pact between Nazi Germany and the USSR.

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the answer would be:

b. race