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The rapid development of the mass media during the 1920s

Apromoted a mass migration to rural areas.
Bencouraged Americans to work longer hours
Cpromoted the creation of a national culture
Dsimplified life for most Americans

Verified Answer :

The rapid development of the mass media during the 1920s "c. promoted the creation of a national culture," since millions of Americans would listen to the same broadcasts.