From the 1930s until the end of WWII, which was the dominant popular medium?

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Radio was the dominant popular medium from the 1930s until the end of WWII, as it provided news, entertainment, and propaganda to a wide audience across the world. Television did not become widely available until the late 1940s and was not dominant until the 1950s, and the Internet did not exist as a mainstream medium until the 1990s. Newspapers and mailings were important mediums, but radio reached a larger audience and had a greater impact on popular culture during this time period.

From the 1930s Until the End of WWII, Which Was