Help on this history question?

  • Thread starter Thread starter Artik
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A

Artik

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Okay, which industry grew from $500 million before World War I to $3 billion in 1929?

A.advertising
B.radio and phonograph sales
C.youth culture
D.building

I think it's Radio but I'm not too quite sure cause it could be advertising too? But I don't think they advertised for people to go into the war because didn't they draft people into WW1? But anyway, help would be appreciated. Thanks in advance.
 
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