The term that contributed the LEAST to creating a "jazz age" in the 1920s from the responses provided would be B Red Scare.
The Red Scare refers to the fear of communism and radical political ideas, which was largely a response to the Bolshevik Revolution and other events that instilled fear of a radical left in America. While it was significant in shaping the political landscape of the time, it did not directly contribute to the cultural and social aspects that characterized the Jazz Age, such as the emergence of flappers, the Harlem Renaissance, or the mass production of automobiles, all of which were closely tied to the vibrant cultural changes of the 1920s.